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  • Polymer and Materials Science  (10,227)
  • 42.75
  • 2005-2009  (14)
  • 1965-1969  (8,218)
  • 1950-1954  (2,009)
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  • 1
    facet.materialart.
    Unknown
    In:  Zoologische Mededelingen (0024-0672) vol.80 (2006) nr.4 p.81
    Publication Date: 2010-12-12
    Description: The new genus Lianus of subfamily Doryctinae (Hymenoptera: Braconidae) is described and illustrated. The differences from other genera of Doryctinae are discussed. Both included species originate from the Atlantic forest at Campos do Jordão, São Paulo State, Brazil.
    Keywords: Braconidae ; Doryctinae ; Lianus ; new genus ; Brazil ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 2
    Publication Date: 2007-01-16
    Description: The Pterophoridae (Ochyroticinae, Deuterocopinae, Pterophorinae (Tribus: Platyptiliini, Exelastini, Oxyptilini)) species of the Neotropical fauna are reviewed. The species are redescribed. Moths are illustrated in colour for the first time, their genitalia are illustrated in line drawings. The examination of type specimens revealed the presence of four new synonyms: Platyptilia juanvinas Gielis, 1999, is a junior synonym of Platyptilia gravior Meyrick, 1932; Platyptilia jonesi Gielis, 1996, is a junior synonym of Platyptilia semnopis Meyrick, 1931; Oxyptilus maleficus Meyrick, 1926, is a junior synonym of Leptodeuterocopus neales (Walsingham, 1915); Lioptilus parvus Walsingham, 1880, is a junior synonym of Lioptilodes albistriolatus (Zeller, 1871). During the study of much new material 40 new species were discovered: Leptodeuterocopus tungurahue, L. angulatus, L. panamaensis, L. duchicela, Sochchora mulinus, Melanoptilia nigra, Platyptilia spicula, Stenoptilodes maculatus, S. agricultura, S. heppneri, S. medius, S. altiaustralis, Postplatyptilia nebuloarbustum, P. antillae, P. caribica, P. uruguayensis, P. pluvia, P. seitetazas, P. transversus, P. carchi, P. boletus, P, ugartei, P. drechseli, P. corticis, P. zongoensis, P. vorbecki, Amblyptilia landryi, A. kosteri, Lioptilodes altivolans, L. arequipa, L. yungas, L. salarius, L. cocodrilo, Michaelophorus margaritae, M. bahiaensis, Geina integumentum, Capperia browni, Buckleria brasilia, Megalorhipida paraiso, M. dubiosa. In the larger genera the species are arranged in groups. For a distinct group of species a new genus: Melanoptilia is proposed. A comprehensive checklist of the species has been made. To facilitate identification a key is presented to the genus level.
    Keywords: Pterophoridae ; revision ; Neotropics ; new genus ; new species ; new synonyms ; new combinations ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 3
    facet.materialart.
    Unknown
    In:  NNM Technical Bulletin (13870211) vol.8 (2006) p.1
    Publication Date: 2007-01-12
    Description: A bibliography of the family Braconidae/Hymenoptera: Ichneumonidae is given for the period 1964-2003. It is an addition to Shenefelt's bibliography (1965), which covers the period 1785-1963. In total 10,436 references are listed.
    Keywords: Insecta ; Hymenoptera ; Braconidae ; bibliography ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 4
    Publication Date: 2010-12-12
    Description: The European species of the genus Helorus Latreille, 1802, are keyed and illustrated, with special reference to their distribution in The Netherlands. Three of the four European species are newly reported for The Netherlands. The description of a new species from Sulawesi (Indonesia) is added: H. celebensis spec. nov.
    Keywords: Hymenoptera ; Proctotrupoidea ; Heloridae ; Helorus, Europe ; Netherlands ; Wallacean ; Indonesia ; Sulawesi ; new species. ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 5
    facet.materialart.
    Unknown
    In:  Zoologische Mededelingen (0024-0672) vol.80 (2006) nr.1 p.73
    Publication Date: 2010-12-12
    Description: Two new genera of Entedoninae are described from Afrotropical region. The genus Janicharis gen. nov. (type species: J. africana spec. nov.) is described from Cameroon, Nigeria and Madagascar. The genus Hakuna gen. nov. (type species: H. matata spec. nov.) is described from Uganda. Both genera have a rather characteristic habitus and a peculiar propodeum bearing large anterolateral strips. A new, but yet unnamed, species of the genus Trisecodes Delvare & LaSalle, 2000, is recorded from Cameroon. This is the fi rst Afrotropical record of this genus, originally described from the Neotropical region.
    Keywords: Hymenoptera ; Eulophidae ; Entedoninae ; Afrotropical region ; propodeum ; new genera ; new species ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 6
    Publication Date: 2007-01-16
    Description: In total 32 new species of Tenthredinidae are described from Vietnam and 18 new species from Indonesia: Nesoselandria albotonkinensis spec. nov., N. albeotegularissima spec. nov., N. devriesiana spec. nov., Anapeptamena achterbergiana spec. nov., Neostromboceros nigrogiganteus spec. nov., N. gracilioides spec. nov., N. alboclypeatus spec. nov., N. daoensis spec. nov., N. phuongensis spec. nov., Abusarbidea bicoloristigmata spec. nov., Eusunoxa alboapicalis spec. nov., Neopoppia tonkinometallica spec. nov., Abeleses vietnamensis spec. nov., A. metallotonkinensis spec. nov., Heptamelus tonkinensis spec. nov., Athlophorus devriesi spec. nov., Rhopographus vietnamensis spec. nov., Xenapatidea hematothoracica spec. nov., X. devriesi spec. nov., Allantidea achterbergiana spec. nov., Neothrinax nigrotonkinensis spec. nov., Indotaxonus flavissimus spec. nov., Darjilingia vietnamensis spec. nov., D. tonkinensis spec. nov., D. hoangliensis spec. nov., Ferna achterbergi spec. nov., Monophadnus bicoloritonkinensis spec. nov., Eutomostethus phongdiensis spec. nov., Eutomostethus albotegularissimus spec. nov., Tenthredo octomaculatus spec. nov., T. tricoloritonkinensis spec. nov. and T. danangiensis spec. nov. from Vietnam. Neostromboceros pleuronotatus spec. nov., N. albopedissimus spec. nov., N. flavopedis spec. nov., N. rubroguinealis spec. nov., N. rubromalayensis spec. nov., Eusunoxa malaya spec. nov., Emphytus danumiensis spec. nov., Hemibeleses sulawesiensis spec. nov., Neopoppia irregulata spec. nov., Tenthredo nigrosabahensis spec. nov., T. djampangensis spec. nov., Neothrinax kaindiensis spec. nov., N. excavata spec. nov., N. gedehensis spec. nov., Abeleses metallojavanus spec. nov., Caliroa nigrojavana spec. nov., Nesoselandria sulawesiensis spec. nov. and Athlophorus achterbergianus spec. nov. from Indonesia. Monophadnus glaucus Enderlein, 1919; Monophadnus sumatranus Enderlein, 1919; Amonophadnus nigripennis Benson, 1935; Amonophadnus nigrojavanus Haris, 2002; Corporaalinus azureus Forsius, 1925; Corporaalinus cyanescens Forsius, 1925; and Corporaalinus jacobsoni Forsius, 1929, are proposed as new synonyms of Monophadnus rivalis Konow, 1906. An identification key is added for the known Tenthredinidae of Borneo, Sumatra, Java, Sulawesi and New Guinea.
    Keywords: Hymenoptera ; Symphyta ; Tenthredinidae ; Vietnam ; Indonesia ; Malaysia ; Java ; Sumatra ; Borneo ; Celebes ; Papua New Guinea ; new species ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 7
    Publication Date: 2010-12-12
    Description: Two new host records for Exasticolus fuscicornis (Cameron, 1887)(Hymenoptera: Braconidae: Homolobinae)are presented with detailed larvae morphology and other biological information.
    Keywords: Braconidae ; Homolobinae ; Exasticolus fuscicornis ; host record ; Geometridae ; Noctuidae. ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 8
    facet.materialart.
    Unknown
    In:  Zoologische Mededelingen (0024-0672) vol.80 (2006) nr.1 p.13
    Publication Date: 2010-12-12
    Description: Thirty species belonging to 16 genera of the family Braconidae (Hymenoptera) are reported from Greenland. Seven are new species described and illustrated below: Dacnusa groenlandica spec. nov.; Aphidius tarsalis spec. nov.; Praon brevistigma spec. nov.; Blacus (B.) groenlandicus spec. nov.; Cotesia crassifemorata spec. nov.; C. fascifemorata spec. nov. and Microplitis lugubroides spec. nov.
    Keywords: Braconidae ; Alysiinae ; Aphidiinae ; Blacinae ; Doryctinae ; Euphorinae ; Hormiinae ; Microgastrinae ; Rogadinae ; Nearctic ; Palaearctic ; Greenland ; distribution ; new species ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 9
    facet.materialart.
    Unknown
    In:  Zoologische Mededelingen (0024-0672) vol.80 (2006) nr.4 p.91
    Publication Date: 2010-12-12
    Description: The little-known monotypic genus Paracyphocrania Redtenbacher, 1908 (Phasmatinae: Phasmatini) is reviewed and now comprises two species: P. lativentris Redtenbacher, 1908, and P. tecticollis (Redtenbacher, 1908) comb. nov., which are redescribed and illustrated. A neotype is designated for P. lativentris which is newly recorded from Sulawesi.
    Keywords: Phasmatodea ; Phasmatinae ; Phasmatini ; Paracyphocrania ; Paracyphocrania lativentris ; Vasilissa tecticollis ; Sulawesi ; Philippines ; description ; egg. ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 10
    facet.materialart.
    Unknown
    In:  Zoologische Mededelingen (0024-0672) vol.80 (2006) nr.4 p.87
    Publication Date: 2010-12-12
    Description: Vestalaria vinnula spec.nov. (holotype male, southern Vietnam, Lam Dong province, Blao, 1962) is described in both sexes and compared with other species of Vestalaria May, 1935 (= the Vestalis smaragdina - group), which is ranked as valid genus.
    Keywords: Odonata ; Calopterygidae ; Vestalaria ; new species ; Vietnam ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 11
    facet.materialart.
    Unknown
    In:  Zoologische Mededelingen (00240672) vol.79-2 (2005) p.179
    Publication Date: 2007-01-16
    Description: A new species of the genus Artocella van Achterberg is described from Spain. On the basis of its substantial sexual dimorphisim, the differences between the two previously known species of this Turanian-Mediterranean genus, which had each been described from specimens of only one (and differing) sex, are reassessed.
    Keywords: Hymenoptera ; Braconidae ; Rogadinae ; Artocella ; new species ; Spain ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 12
    facet.materialart.
    Unknown
    In:  Zoologische Mededelingen (00240672) vol.79-2 (2005) p.123
    Publication Date: 2007-01-16
    Description: Dasypoda intermedia spec. nov. from Iran is described. Its description fills a gap of our knowledge of the East Mediterranean fauna of the genus Dasypoda. The West Mediterranean Dasypoda species are well known but the eastern species lack convincing records. Moreover, D. intermedia spec. nov. is a very interesting species from a phylogenetic point of view. It shares some characters common to subgenera Dasypoda s. str. and Megadasypoda Michez, 2004, which provide further evidence for the close relationship of both subgenera.
    Keywords: Hymenoptera ; Melittidae ; Dasypoda ; new species ; Iran ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 13
    Publication Date: 2007-01-16
    Description: Thirty-one species of the family Platystictidae of the Philippines are revised, i.e. all species recognised, excluding the species of the Drepanosticta halterata-group. The following new taxa are described: 16 species in Drepanosticta Laidlaw: D. acuta spec. nov., D. aurita spec. nov., D. centrosaurus spec. nov., D. clados spec. nov., D. flavomaculata spec. nov., D. furcata spec. nov., D. hermes spec. nov., D. krios spec. nov., D. luzonica spec. nov., D. malleus spec. nov., D. myzouris spec. nov., D. paruatia spec. nov., D. pistor spec. nov., D. quadricornu spec. nov., D. rhamphis spec. nov., D. trachelocele spec. nov., two in Protosticta Selys, viz. P. lepteca spec. nov. and P. plicata spec. nov., and three in Sulcosticta gen. nov., viz. S. striata spec. nov., S. pallida spec. nov. and S. viticula spec. nov. The status of eleven previously described nominal taxa is established. One, D. septima Needham & Gyger, is doubtfully considered a synonym of D. mylitta Cowley. Based on a preliminary phylogenetic analysis, the species of Drepanosticta are divided into informal species groups. Most species of the Philippines have affinities to species of Sulawesi, the Moluccas and New Guinea. Several species confined to Palawan have sister-group relationships with species from Borneo. The affinities of various other species confined to the Sulu archipelago, are unsettled as yet. The species of Platystictidae here assigned to Protosticta Selys are presumably not closely related to the type species, P. simplicinervis Selys from Sulawesi. However, a better placement has to await a more detailed phylogenetic study of the family. For three species the new genus Sulcosticta gen. nov. is erected. These species are closely allied based on the structure of the appendages, but should have been assigned to different genera if based on the present generic definitions. Many species here described have small distributional ranges, a common phenomenon in Platystictidae. Since most forests in the Philippines are heavily under threat or have already disappeared in the last fifty years, several taxa described in this paper should be considered under threat of immediate extinction.
    Keywords: Odonata ; Platystictidae ; Drepanosticta ; Protosticta ; Sulcosticta ; Philippines ; new species ; new genus ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
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  • 14
    Publication Date: 2007-01-16
    Description: In this part the remaining 78 species of the genus Pepsis, belonging to ten species-groups, are described and figured, and their phylogenetics and biogeography are discussed. 14 of the species are described as new: P. achterbergi spec. nov., P. adonta spec. nov., P. boharti spec. nov., P. caliente spec. nov., P. dayi spec. nov., P. esmeralda spec. nov., P. ianthoides spec. nov., P. jamaicensis spec. nov., P. krombeini spec. nov., P. martini spec. nov., P. multichroma spec. nov., P. nanoides spec. nov., P. wahisi spec. nov., and P. willinki spec. nov. Three species-names, P. infuscata Spinola, 1841, P. lampas Lucas, 1895, and P. thoreyi Dahlbom, 1845, are recalled from synonymy. The following 293 names are newly synonymized (the valid names are listed first): P. atalanta Mocsáry, 1885 = P. nitens Mocsáry, 1894, P. mocsaryi Lucas, 1895; P. inclyta Lepeletier, 1845 = P. mutabilis Lepeletier, 1845, P. vagabunda Lepeletier, 1845, P. cupripennis Taschenberg, 1869, P. violaceipennis Mocsáry, 1885, P. clotho Mocsáry, 1888, P. spengeli Mocsáry, 1888, P. sickmanni Mocsáry, 1888, P. nireus Mocsáry, 1894, P. atrovirens Lucas, 1895, P. cerastes Lucas, 1895, P. pygidialis Brèthes, 1908, P. guaranitica Brèthes, 1908, P. parca Lucas, 1919, P. atahualpa Banks, 1946, opimicornis, Haupt, 1952, atropos, Haupt, 1952, azurea Haupt, 1952; crassicornis Mocsáry, 1885 = P. sappho Brèthes, 1908, P. nitocris Brèthes, 1908, P. vivida Brèthes, 1908, P. arechavaletai Brèthes, 1908, P. lynchii Brèthes, 1908, P. operosa Brèthes, 1908, P. ataraqua Banks, 1946, P. splendida Haupt, 1952; P. sommeri Dahlbom, 1845 = P. azteca Cameron, 1893; P. xanthocera Dahlbom, 1843 = P. nigrescens Smith, 1855, P. fulgidipennis Mocsáry, 1885, P. juno Brèthes, 1908, P. ismare Banks, 1946, P. nigroprasina Haupt, 1952; P. seifferti Lucas, 1895 = P. cornuta Lucas, 1895, P. moebiusi Lucas, 1895, P. stygia Lucas, 1895; P. luteicornis Fabricius, 1804 = P. strenua Erichson, 1848, P. tinctipennis Smith, 1873, P. citreicornis Mocsáry, 1894, P. venosa Banks, 1945, P. alector Banks, 1946; P. asteria Mocsáry, 1894 = P. luridicornis Brèthes, 1926; P. convexa Lucas, 1895 = P. humeralis Brèthes, 1914; P. helvolicornis Lucas, 1895 = P. bahiae Brèthes, 1914; P. vitripennis Smith, 1855 = P. obscura Lepeletier, 1845, P. amabilis Mocsáry, 1885, P. centralis Cameron, 1893, P. margarete Lucas, 1895, P. venezuelae Kaye, 1913, P. aeneipennis Banks, 1946, P. helenae Haupt, 1952, P. coeruleoviridis Haupt, 1952; P. fumipennis Smith, 1855 = P. pallidicornis Mocsáry, 1885; P. amyntas Mocsáry, 1885 = P. vicina Lucas, 1895, P. clarinervis Brèthes, 1908, P. amyntoides Lucas, 1919, P. eurydice Lucas, 1919; P. dimidiata Fabricius, 1804 = P. vittigera Lucas, 1897, P. argentina Brèthes, 1908, P. sanctaeannae Brèthes, 1908, P. virgo Brèthes, 1908, P. externa Brèthes, 1908, P. transversa Brèthes, 1908, P. cordubensis Brèthes, 1908, P. banghaasi Lucas, 1919; P. menechma Lepeletier, 1845 = P. elegans Lepeletier, 1845, P. dubitata Cresson, 1867, P. prismatica Smith, 1855, P. advena Mocsáry, 1885, cinctipennis Mocsáry, 1885, P. guatemalensis Cameron, 1893, P. nestor Mocsáry, 1894, P. nigricornis Mocsáry, 1894, P. auranticornis Lucas, 1895, P. fruhstorferi Lucas, 1895, P. concolor Lucas, 1895, P. cerberus Lucas, 1895, P. euchroma Lucas, 1895, P. nigrocincta Lucas, 1895, P. mordax Lucas, 1895, P. inermis Fox, 1898, P. roberti Brèthes, 1908, P. janira Brèthes, 1908, P. cultrata Brèthes, 1908, P. novitia Banks, 1921; P. decipiens Lucas, 1895 = P. similis Lucas, 1895; P. minarum Brèthes, 1914 = P. pulchra Brèthes, 1914; P. basifusca Lucas, 1895 = P. angustimarginata Viereck, 1908; P. chrysoptera Burmeister, 1872 = P. exigua Lucas, 1895, P. smaragdinula Lucas, 1895, P. nebulosa Lucas, 1895, P. karschi Lucas, 1895, P. anisitsii Brèthes, 1908, P. indistincta Brèthes, 1908, P. dimidiatipennis Brèthes, 1908, P. chloroptera Brèthes, 1908, P. culta Brèthes, 1908, P. recta Brèthes, 1908, P. tornowii Brèthes, 1908, P. schrottkyi Brèthes, 1908, P. itinerata Brèthes, 1908, P. miniata Brèthes, 1908, P. spegazzinii Brèthes, 1908, P. paulistana Brèthes, 1914, P. chloe Brèthes, 1914, P. coronaria Brèthes, 1914, P. semilucana Haupt, 1952, P. bruneipes Haupt, 1952, P. brachynotus Haupt, 1952, P. diagonalis Haupt, 1952, P. discrepans Haupt, 1952; P. elongata Lepeletier, 1845 = P. purpurascens Smith, 1855, P. fuscipennis Smith, 1873, P. longula Banks, 1946; P. australis Saussure, 1867 = P. centaurus Lucas, 1897; P. cyanescens Lepeletier, 1845 = P. micans Mocsáry, 1885, P. jucunda Mocsáry, 1885, P. balloui Banks, 1946, P. diversa Haupt, 1952; P. lampas Lucas, 1895 = P. venturii Schrottky, 1902; P. nitida Lepeletier, 1845 = P. lucidula Smith, 1855, P. vaualba Smith, 1855, P. pruinosa Mocsáry, 1894, P. cylindrica Lucas, 1895, P. andina Brèthes, 1908, P. dilatata Brèthes, 1908, P. holmbergi Brèthes, 1908, P. concava Brèthes, 1908, P. ephebus Brèthes, 1908, P. vaga Brèthes, 1908, P. fuscobasalis Brèthes, 1908, P. cordata Brèthes, 1914, P. impatiens Brèthes, 1914, P. tricolor Brèthes, 1914, P. joergenseni Brèthes, 1914, P. cleone Brèthes, 1914, P. dorsata Brèthes, 1914, P. aretheas Brèthes, 1914, P. lassonis Lucas, 1819, P. consors Banks, 1946, P. interrupta Banks, 1946, P. analis Haupt, 1952; P. seladonica Dahlbom, 1843 = P. deuteroleuca Smith, 1855, P. kohli Lucas, 1895, P. venezolana Brèthes, 1908, P. burmeisteri Brèthes, 1908; P. cybele Banks, 1945 = P. weberi Banks, 1946; P. thoreyi Dahlbom, 1845 = P. lurida Lucas, 1895, P. euterpe Brèthes, 1908; P. flavescens Lucas, 1895 = P. periphetes Lucas, 1895, P. limbatella Brèthes, 1908, P. discoidalis Brèthes, 1914, P. limbatica Brèthes, 1914, P. militaris Brèthes, 1914, P. cavillatrix Haupt, 1952, P. arcuata Haupt, 1952, P. recterugosa Haupt, 1952, P. adversatrix Haupt, 1952; P. nigricans Lucas, 1895 = P. troglodytes Brèthes, 1908; P. montezuma Smith, 1855 = P. quitonensis Packard, 1869, P. sibylla Mocsáry, 1885, P. circe Mocsáry, 1885, P. occidentalis Cameron, 1893, P. peruanus Lucas, 1895, P. fulva Lucas, 1895, P. nessus Lucas, 1895, P. fusca Lucas, 1895, P. andicola Cameron, 1903, P. chilloensis Cameron, 1903, P. patagonica Brèthes, 1908, P. fasciculata Brèthes, 1908, P. pisoensis Strand, 1911, P. pacifica Brèthes, 1914, P. huascar Banks, 1946; P. completa Smith, 1855 = P. quichua Brèthes, 1908, P. comes Banks, 1946; P. smaragdina Dahlbom, 1843 = P. thunbergi Dahlbom, 1843, P. lara Mocsáry, 1888, P. satrapes Lucas, 1895, P. nupta Lucas, 1895, P. erynnis Lucas, 1895, P. fraterna Lucas, 1895, P. diabolus Lucas, 1895, P. mystica Lucas, 1895, P. thalia Brèthes, 1908, P. brasiliensis Brèthes, 1908, P. pallida Brèthes, 1908, P. iheringi Brèthes, 1908, P. dromeda Brèthes, 1908, P. sepultrix Lucas, 1919, P. strickeri Lucas, 1919; P. discolor Taschenberg, 1869 = P. sinnis Lucas, 1895, P. jujuyensis Brèthes, 1908, P. modesta Brèthes, 1908, P. comparata Brèthes, 1908, P. neutra Brèthes, 1908, P. terebrans Brèthes, 1908, P. procera Haupt, 1952, P. plaumanni Haupt, 1952, P. ogloblini Haupt, 1952, P. deletrix Haupt, 1952; P. limbata Guérin, 1831 = P. richteri Brèthes, 1908, P. polita Brèthes, 1908, P. limbella Haupt, 1952, P. artemis Haupt, 1952; P. basalis Mocsáry, 1885 = P. erdmanni Lucas, 1895, P. basinigra Haupt, 1952; P. infuscata Spinola, 1841 = P. niobe Mocsáry, 1885, P. sagana Mocsáry, 1894, P. incerta Banks, 1946; P. hyalinipennis Mocsáry, 1885 = P. subruficornis Haupt, 1952; P. festiva Fabricius, 1804 = P. pulchella Lepeletier, 1845, P. solitaria Smith, 1879, P. gallardoi Brèthes, 1908, P. hora Brèthes, 1914, P. amok Lucas, 1919, P. riojaneirensis Lucas, 1919; P. gracilis Lepeletier, 1845 = P. diana Mocsáry, 1885, P. hecate Mocsáry, 1885, P. spathulifera Lucas, 1895, P. sphinx Lucas, 1895, P. ierensis Banks, 1945, P. alceste Banks, 1946, P. scalaris Haupt, 1952; P. mildei Stål, 1857 = P. charon Mocsáry, 1885, P. cyanoptera Lucas, 1895, P. dryas Lucas, 1919; P. filiola Brèthes, 1914 = P. denserugosa Haupt, 1952; P. ruficornis Fabricius, 1804 = P. saphirus Palisot de Beauvois, 1805, P. violacea Mocsáry, 1885, P. hexamita Lucas, 1895, P. omniviolacea Haupt, 1952; P. brunneicornis Lucas, 1895 = P. glabripennis Lucas, 1895; P. purpurea Smith, 1873 = P. pan Mocsáry, 1885, P. parthenope Mocsáry, 1885, P. sagax Lucas, 1895, P. clypeata Brèthes, 1914, P. consimilis Banks, 1946, P. laconia Banks, 1946; P. viridisetosa Spinola, 1841 = P. eximia Smith, 1873; P. viridis Lepeletier, 1845 = P. errans Lepeletier, 1845, P. chlorotica Mocsáry, 1885, P. excelsa Lucas, 1895, P. selene Lucas, 1895, P. fimbriata Lucas, 1895, P. calypso Brèthes, 1908, P. fluminensis Brèthes, 1908, P. argentinicus Strand, 1910, P. mimetica Brèthes, 1914, P. garbei Brèthes, 1914, P. erecta Brèthes, 1914, P. tandilensis Brèthes, 1914, P. meridionalis Brèthes, 1914, P. minor Lucas, 1919, P. basifulgens Lucas, 1919, P. nebulosipennis Lucas, 1919, P. purpurea Lucas, 1919, P. koerberi Lucas, 1919, P. inimicissima Lucas, 1919, P. debilitans Lucas, 1919, P. itapaca Banks, 1946; P. aciculata Taschenberg, 1869 = P. nero Lucas, 1895; P. atripennis Fabricius, 1804 = P. flavilis Brèthes, 1908; P. ianthina Erichson, 1848 = P. fulvicornis Mocsáry, 1885, P. sirene Lucas, 1895, P. balboae Lucas, 1919, P. herodes Lucas, 1919, P. curti Lucas, 1919; P. nana Mocsáry, 1885 = P. mapiriensis Lucas, 1919, P. vinciens Lucas, 1919, P. ilione Banks, 1946, P. moesta Banks, 1946, P. orestes Banks, 1946, P. amautas Banks, 1946, P. inaequalis Haupt, 1952; P. hirtiventris Banks, 1946 = P. viridaurea Haupt, 1952, P. aequalis Haupt, 1952; P. auriguttata Burmeister, 1872 = P. aurimacula Mocsáry, 1885, P. flavicornis Mocsáry, 1894, P. guttata Lucas, 1895, P. incendiaria Lucas, 1895, P. pubiventris Lucas, 1895, P. planifrons Lucas, 1895, P. lestes Lucas, 1895, P. villosa Brèthes, 1908; P. sabina Mocsáry, 1885 = P. astioles Banks, 1946; and P. purpureipes Packard, 1869 = P. chlorana Mocsáry, 1885, P. antennalis Cameron, 1893, P. sulcifrons Cameron, 1903, P. carinata Brèthes, 1914, P. equatoriana Brèthes, 1914, P. angusta Banks, 1946. Keys to all forms are given. The mimicry-groups of P. atripennis Fabricius, 1804, and P. completa Smith, 1855, are defined and described and a comparative account of mimicry based on all four mimicrygroups in Pepsis is given. Lists of excluded species (with their current taxonomic placement and depository where ascertained), unplaced names, and a nomen nudum are given.
    Keywords: spider-hunting wasps ; Pompilidae ; Pepsis ; systematic revision ; new species ; mimicry ; Neotropical ; natural history ; 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 1-12 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Investigation into the pitting corrosion of passive austenitic CrNi steels in neutral chloride solutionsStainless steels of the 18/8 CrNi-Type suffer pitting corrosion by halogen ions. Potentiokinetic, galvanostatic and potentiostatic tests as well as the ferro-ferricyanide-tests showed that pitting susceptibility increases with Cl- content, temperature and oxygen content of the electrolyte, with decreasing homogeneity and purity of the material. Cold-working is without significant influence on the pitting potential. Mn up to 11,2% increases pitting potential by 50 mV, Ni up to 25% increases the potential by 200 mV, Cr up to 30 and Mo up to 4,6% increase the potential by max. 900 mV in 3% NaCl of pH 7,5 at 22° C. The four methods employed gave the same pitting potentials. Before arriving at the potential of stationary pitting all steels showed a region where formation and repassivation of single pits occur.Cathodic protection to suppress pitting causes H2-absorption. The amount of absorbed H2 increases as the potential becomes more negative. Hydrogen embrittlement was not observed. The absorbed H2 impairs pitting resistance. The study of Cl--adsorption as a pitting releasing process by help of the potentiostatic method, working with a reference source of triangular alternating voltage gave no indication of a preferential Cl--adsorption or an Cl--adsorption-potential near the pitting potential.
    Notes: Passive 18/8 Cr-Ni-Stähle unterliegen der durch Halogenionen hervorgerufenen Lochfraßkorrosion. Die Durchführung potentiokinetischer, potentiostatischer und galvanostatischer Versuche sowie des Indikatortestes zeigte, daß die Lochfraß-anfälligkeit von Chrom-Nickel-Stählen mit dem Chlorionengehalt, der Temperatur und dem Sauerstoffgehalt des Elektrolyten sowie mit abnehmender Homogenität und Reinheit des Werkstoffes ansteigt. Eine Kaltverformung zeigt keinen eindeutigen Einfluß. Überhöhte Potential-Vorschubgeschwindigkeiten verfälschen das Ergebnis der potentiokinetischen Messungen des Lochfraßpotentials. In 3%iger NaCl-Lösung vom pH-Wert 7,5 bei 22° C erhöhen Mn-Gehalte bis 11,2% und Ni-Gehalte bis 25% das Lochfraßpotential um maximal 50 bzw. 200 mV, Cr-Gehalte bis 30% sowie Mo-Gehalte bis 4,6% steigern das Lochfraßpotential um maximal 900 mV. Die vier Untersuchungsverfahren ergaben Übereinstimmende Ergebnisse bzw. Lochfraßpotentiale. Alle Stähle zeigten vor dem Potential des stationären Lochfraßes einen Potentialbereich, in dem repassivierbarer Lochfraß beobachtet wurde.Kathodischer Schutz zur Verhinderung von Lochfraß bewirkt eine mit negativer werdendem Potential zunehmende Wasserstoffaufnahme, jedoch keine Beeinflussung der Kerbschlagzähigkeit. Dagegen vermindert der aufgenommene Wasserstoff die Lochfraßbeständigkeit des Stahls. Die Untersuchung der Chlorionenadsorption als lochfraßauslösendem Vorgang mit der potentiostatischen Dreiecksspannungsmethode ergab keinen Hinweis auf die bevorzugte Cl--Adsorption oder ein Cl--Adsorptionspotential in der Nähe des Lochfraßpotentials.
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 35-37 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 30-35 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Application of zirconium in chemical plant constructionIt ist in this decade only, that zirconium has become an established special material in chemical plant construction. Zirconium is used in particular where high corrosion resistance is required, e.g. with processes involving sulfuric, hydrochloric, nitric and phosphoric acids, chlorides (except ferric and cupric chlorides), alkalies, urea, hydrogen peroxide and lactic acid. Preferred types of equipment are reaction columns, pump casing, heat exchangers and tubing, e.g. in connection with the production of dyes, pigments (erosion resistance), foods, hydrogen peroxide and urea. The price of zirconium, though still high if compared with that of nickel-base alloys or high-alloy stainless steels is soon amortized as a consequence of the low maintenance requirement.
    Notes: Zirkonium ist im Laufe von nur 10 Jahren zu einem fest eingeführten Sonderwerkstoff des Apparatebaues geworden. Es wird vor allem bei hohen Ansprüchen an die Korrosionsbeständigkeit eingesetzt, z.B. bei Verfahren mit Schwefel-, Salz-, Salpeter- und Phosphorsäure, Chloriden (außer Eisen-III- und Kupfer-II-chlorid), Alkalien, Harnstoff, Wasserstoffsuperoxid, Milchsäure. Bevorzugte Apparaturen sind Reaktionstürme, Pumpengehäuse, Wärmeaustauscher und Rohrleitungen, z.B. bei der Herstellung von Farbstoffen, Pigmenten (Erosionsbeständigkeit), Nahrungsmitteln, Wasserstoffsuperoxid und Harnstoff. Der noch immer höhere Preis des Zirkoniums im Verleich mit Legierungen auf Bickelbasis oder hochlegierten nichtrostenden Stählen amortisiert sich bald aufgrund des geringen Wartungsbedarfs.
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 54-67 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 77-79 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 85-85 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 86-86 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969) 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 102-108 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Occurrence, formation and phase transformation of β-FeOOH in rustA prerequisite to the formation of β-FeOOH is the presence of chloride or fluoride ions. These may take the form of corresponding acids, or of their salts. β-FeOOH is formed in the presence even of minute quantities of chloride, e. g. also under conditions of pitting corrosion, when FeCl2, - 4 H2O is formed. If the chloride input ceases, the hitherto unaffected surfaces will be affected by the normal α or γ-FeOOH, as the chloride ions are then fixed in the β-FeOOH lattice. β-FeOOH remains stable at low PH values only; at higher PH values, it is transformed into the α-modification or hematite. In contact with metallic iron, β-FeOOH has the effect of accelerating the corrosion rate, probably because of the continued liberation of chloride ions.
    Notes: Für die Bildung von β-FeOOH ist die Anwesenheit von Chlorid- oder Fluoridionen Voraussetzung. Diese können in Form der entsprechenden Säuren oder auch von Salzen vorliegen. Schon bei An- wesenheit kleinster Chloridmengen entsteht dabei β-FeOOH, z. B. auch unter Lochfraßbedingungen, wobei FeCl2·4H2O entsteht. Hört die Chloridzufuhr auf, so entsteht an den freien Flüchen noch das übliche α- oder γ-FeOOH, da die Chlorionen dann im Gitter von β-FeOOH fixiert sind. Das β-FeOOH ist nur bei niedrigen PHWerten stabil, bei höheren Werten wandelt es sich in die σ-Modifkation oder in Hämatit um. σ-FeOOH wirkt in Kontakt mit metallischem Eisen korrosionsbeschleunigend, wahrscheinlich weil hierbei immer wieder Chlorionen freiwerden.
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 125-126 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Description / Table of Contents: The chemical equilibria encountered with the chromium-plating of steelIn order to determine the equilibrium conditions, the authors investigated, in the compound system Fe(s) + CrJ2(g) ⇌ Cr(s) + FeJ2(g) used for diffusion-type chromium plating, the two stages Cr(s)+ 2J(g) ⇌ CrJ2(g) and Fe(s) + 2J(g) ⇌ FeJ2(g) which determine the reaction rate. The former stage was investigated at a temperature range of 700 to 1160° C, the latter at 760 to 1080° C. In this temperature range, the equilibrium is shifted somewhat to the left, the shift increasing with higher temperatures. However, as the general correlation of the equilibrium constants with temperature is low, it may be assumed that chromium-plating could be carried out over a much wider temperature range than is usual at present.
    Notes: Für die Ermittlung der Gleichgewichts-beziehungen wurden in dem für die Diffusionsverchromung verwendeten Verbindungs-system Fe(f) + CrJ2(g) ⇌ Cr(f) + FeJ(g) die beiden geschwindigkeitsbestim-menden Schritte Cr(f)+ 2 J(g) ⇌ CrJ2,(g) und Fe(f) + 2 J(g) ⇌ FeJ2(g) untersucht, und zwar die erste bei 700-1100, die zweite bei 760 und 1080° C. Das Gleichgewicht ist im untersuchten Temperaturbereich etwas nach links verschoben, und zwar um so stärker, je höher die Temperatur ist. Die insgesamt geringe Temperaturabhängigkeit der Gleichgewichtskonstanten läßt jedoch vermuten, daß die Inchromierung in einem weit breiteren Temperaturbereich geführt werden kann als es bisher in der Praxis geschieht.
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969) 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 43-48 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 108-118 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: The problem of pitting corrosion with copper pipes in drinking water mainsInvestigations into cases of corrosion observed on copper pipes of water mains in Vienna and Linz have given rise to some useful practical knowledge concerning corrosion prevention: Lengthy periods of stagnation after the installation are detrimental whilst short periods of stagnation are beneficial. This is because, in the latter case, protective layers (Cu2O) are formed whilst, in the former case  -  and especially if there is no intermediate rinsing  -  the sedimentation of suspend matter is liable to cause the formation of a non-uniform cover layer. The thickness of the cover layer must not exceed a certain critical value as the elasticity of the layer would otherwise decline so that metal would be bared when the pipe is bent. Soldering at the time of installation calls for great care since soldering remnants are, in principle, detrimental. In contrast, the aggressivity of the water (ions, sedimentations) is not of major importance if the above-mentioned conditions are met.
    Notes: Untersuchungen an Korrosionsfällen in kupfernen Wasserleitungsrohren (Wien und Linz) ermöglichen einige für die Praxis wichtige Hinweise zur Korrosionsverhinderung: längere Stillstandsperioden nach Installation sind ungünstig, kürzere Stillstandsperioden hingegen günstig, weil im letzten Falle schützende Deckschichten entstehen (Cu2O), während im ersten Falle  -  besonders, wenn zwischenzeitlich nicht gespült wird. Die Dicke der entstehenden Deckschicht darf eine gewisse Grenze nicht überschreiten, da sonst die Elastizität der Deckschichten abnimmt und beim Biegen der Rohre Metall freigelegt wird. Löten bei der Installation erfordert große Vorsicht, da Lötmittelrückstände grundsätzlich nachteilig sind. Die Aggressivität des Wassers (Ionen, Ablagerungen) spielt hingegen keine große Rolle, sofern die obengenannten Voraussetzungen erfüllt sind.
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 73-75 
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 80-84 
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    Keywords: Chemistry ; Polymer and Materials Science
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    ISSN: 0947-5117
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 12-19 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: The effect of water on paint coatingsThe water absorption of varnishes and organic coatings is normally known as “swelling”. In many cases, however, a homogeneous water absorption through swelling of the polymer substance is of lesser importance than a heterogeneous water absorption. The latter may occur at the inner interfaces of a lacquers or plastic coating, e.g. at the interface between coating base, at the interface between polymer substance (binder) and filler (pigment), or at the interfaces within the polymer substance itself. One important cause of heterogeneous water absorption is the occurence of osmotic processes which are caused by water soluble substances present or originating at the boundaries. With such absorption, the freezing temperature of the polymer substance plays an important part. It is possible to ascertain experimentally how polymer films are absorbing the water. In this way, the influence of water on the film properties can be better evaluated than by simply ascribing all the water intake to a swelling process.
    Notes: Die Wasserabsorption von Lacken und organischen Beschichtungen wird üblicherweise als Quellung bezeichnet. Häufig ist aber eine homogene Wasserabsorption durch Quellung der Polymersubstanz gegenüber einer heterogenen Wasseraufnahme von untergeordneter Bedeutung. Eine hetrogene Wasseraufnahme kann an inneren Grenzflächen einer Lack- oder Kunststoffbeschichtung erfolgen, z.B. an der Grenzfläche zum Untergrund, an der Grenzfläche zwischen Polymersubstanz (Bubdenuttek) und Füllstoff (Pigment) oder an Grenzflächen innerhalb der Polymersubstanz selbst. Eine wichtige Ursache für heterogene Wassereinlagerungen sind osmotische Vorgänge, die durch an den Grenzflächen vorhandene oder dort entstehende wasserlösliche Stoffe verusacht werden. Die Einfriertemperatur der Polymersubstanz spielt bei dieser Einlagerung eine wichtige Rolle. Es ist experimentell möglich, festzustellen, in welcher Weise gefükkte Polymerfilme Wasser absorbieren. Dadurch läßt sich der Einfluß von Wasser auf Filmeigenschaften besser beurteilen, als wenn alles aufgenommene Wasser summarich einem Quellungsvorgang zugeschrieben wird.
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 19-22 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Adhesive strength in interfacesOn the thesis that the adhesion between two phases - e.g. coating and substratum - is a function of the interfacial tension at the phase boundary concerned, tests have been carried out on a number of different surface protection systems. To begin with the thesis was corroborated by testing the adhesive strength of PTFE powder on different plastics. It was also found that the tensile and peeling strength calues of glued plastics show a rapid decline as the interfacial tension between plastics and hardened adhesive increases. In analogy, the same correlation was found to apply to the fouling resistance of coatings. -With decreasing interfacial tension, i.e. with increasing wettability, the resistance to fouling will decrease. In practice, it is necessary to accept a compromise in order to obtain an adequate adhesive strength of the lacquers film yet, at the same time, a low fouling-proneness.
    Notes: Ausgehend von der Annahme, daß die Haftfestigkeit zwischen zwei Phasen -z.B. Anstrichfilm und Substrat- eine Funktion der Grenzflächenspannung an der betreffenden Phasengrenzfläche ist, werden verschiedene Systeme zum Oberflächenschutz überprüft. Zunächst wird die Annahme bestätigt in Versuchen über das Haftvermögen von PTFE-Pulver an verschiedenen Kunststoffen. Außerdem wird gefunden, daß die Zug- und Schälfestigkeit verklebter Kunststoffe mit zunehmender Grenzflächenspannung zwischen Kunststoff und ausgehärtetem Klebstoff rasch abnehmen. In Analogie dazu wurde festgestellt, daß die gleiche Beziehung auch für die Verschmutzbarkeit von Anstrichfilmen gilt: mit abnehmender Grenzflächenspannung, d.h. zunehmender Benetzbarkeit, nimmt die Verschmutzungsanfälligkeit zu. In der Praxis ist man gezwungen, einen Kompromiß zu suchen, um einerseits austeichende Haftfestigkeit des Lackfilms und andererseits geringe Verchmutzungsanfälligkeit zu erhalten.
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 126-126 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 27-29 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Corrosion indicator for devices made of metals capable of passivationThe authors describe a fully transistorized instrument which indicates changes in the corrosion behaviour on the strength of the change in potential of a metal in the vicinity of the passivation potential, and - by means of visual and acoustic signals - indicates the need for remedial measures. Conversely, the instrument is also suited to indicate changes in the surrounding medium so that it can be used for the continuous monitoring of working conditions. Its application is, however, confined to those cases where the difference in the corrosion rates in the active and passive state is considerable.
    Notes: Beschrieben wird ein volltransitorisiertes Gerät, das aufgrund der Potential-änderung eines Metalls in der Umgebung des Passivierungspotentials Änderungen im Korrosionsverhalten anzeigt und damit -über optische und akustische Signale - auf die Notwendigkeit von Abhilfemaßnahmen hinweist. Es eignet sich umgekehrt auch zur Anzeige von Veränderungen im umgebenden Medium und damit zur kontinuierlichen Überwachung von Betriebsbediungungen. Die Anwedung ist allerdings auf die Fälle beschränkt, in denen der Unterschied der Korrosions geschwindigkeit im aktiven und passiven Zustand beträchtlich ist.
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 29-30 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Contribution to the problem of the corrosion of lead in the building industryThe corrosion resistance of lead in mortar can be improved by surface treatment. The best protection is obtained with a chromate layer, followed by phosphate and the sulphate layers. The corrosion resistance of the protective layers is consistently superior when the mill scale on the lead sheet is removed by pickling prior to immersion into the treating solutions. While the useful life of a lead sheet (2.6 mm thick) without surface treatment is about 58 months in lime mortar and 43 months in cement mortar, the respective values for chromated sheets are 147 and 116 months.
    Notes: Die Korrosionsbeständigkeit von Blei in Mörtel kann durch Oberflächenbehandlung verbessert werden. Den besten Schutz bietet eine Chromatierungschicht, etwas schlechter ist eine Phosphatierungsschicht, und die geringste Schutzwirkung besitzt die Sulfatschicht. Der Korrosionswiderstand der Schutzschichten ist immer dann höher, wenn die Walzhaut des Bleibleches vor dem Eintauchen in die deckschichtbildenden Lösungen durch Ätzen entfernt wird. Während die Lebensdauer eines Bleiblechs von 2,6 mm Dicke ohne Oberflächenbehandlung in Kalkmörtel etwa 43 Monate beträgt, liegt sie im Falle der chromatierten Bleche bei 147 bzw. 166 Monaten.
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 37-42 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 67-72 
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 79-80 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 85-85 
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    Keywords: Chemistry ; Polymer and Materials Science
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  • 41
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 86-86 
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    Keywords: Chemistry ; Polymer and Materials Science
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  • 42
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 87-93 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Evaluation of atmospheric corrosion tests with iron, copper and zinc, extending over three years, at Czechoslovak testing stationsAt three testing stations in Czechoslovakia, carbon steel, metallurgical zinc and metallurgical copper were exposed to atmospheric corrosion for three years. Samples were taken for examination after 6 weeks, 14 weeks, 6 months, 12 months and 2 years. The humidity and temperature conditions experienced during the test period were recorded in „climatographs“, and the SO2 contents were measured cumulatively. After a time, the corrosion rate is found to assume a stationary condition which has often not been recognized in previous research work because the initial periods, showing a different behaviour, were included in the evaluation. The results confirm the known close correlation between corrosion and humidity, though different mechanisms must be assumed for the different metals investigated. In the case of Zn and Cu, the SO2 content in the atmosphere is the decisive factor whilst, for Fe, the content of SO42- ions in the rust is more important. In either case, critical values are encountered which are governed, respectively, by the possibility of adsorbing SO2 at the phase boundary and by the possibility of compounding the SO42- ions in the rust.
    Notes: Auf drei atmosphärischen Prüfstationen der ČSSR wurden C-Stahl, Hüttenzink und Hüttenkupfer 3 Jahre lang exponiert; nach 6 Wochen, 14 Wochen, 6 Monaten, 12 Monaten und 2 Jahren wurden Proben zur Untersuchung entnommen. Die während des Versuchszeitraums herrschenden Feuchtigkeits- und Temperaturwerte wurden in Klimatogrammen zusammengefaßt und der SO2-Gehalt kumulativ gemessen. Für die Geschwindigkeit der Korrosion ergibt sich nach einer gewissen Zeit ein stationärer Zustand, der in bisherigen Arbeiten häufig nicht erkannt wurde, weil bei der Auswertung auch die davon abweichenden Anfangsperioden mit berücksichtigt wurden. Die Ergebnisse bestätigen die schon bekannte starke Abhängigkeit der Korrosion von der Feuchtigkeit, wobei für die untersuchten Metalle verschiedene Mechanismen angenommen werden müssen. Für Zn und Cu ist der Gehalt an SO2 in der Atmosphäre entscheidend, während für Fe der Gehalt an SO42--Ionen im Rost ausschlaggebend ist. In beiden Fällen treten kritische Werte auf, die einmal durch die Möglichkeiten der Adsorption von SO2 an der Phasengrenze, zum anderen durch die Bindungsmöglichkeit für SO42--Ionen im Rost bedingt sind.
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 94-98 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Electron-optical and electro-chemical investigation into the passive behaviour of fine lead in hot concentrated sulphuric acidThe passivation of fine lead in hot concentrated sulphuric acid is exclusively governed by a lead sulphate layer. A stable passive condition can only be maintained within a narrow range of potentials. In the trans-passive zone (above + 600 mV), as with potentials below the passivation potential, a loose suphate layer is formed. In either case, pitting corrosion is liable to occur. Whether any compounds of tetravalent lead play a part in the passivation phenomena has not yet been fully clarified.
    Notes: Die Passivierung von Feinblei in heißer konzentrierter Schwefelsäure ist ausschließlich durch eine Bleisulfatschicht bedingt. Der stabile Passivzustand läßt sich nur in einem engen Potentialbereich aufrechterhalten. Im transpassiven Bereich (Über + 600 mV) entsteht ebenso wie bei Potentialen unterhalb des Passivierungspotentials eine lockere Sulfatschicht, wobei es in beiden Fällen zu Lochfraß kommen kann. Ob an den Passivierungsvorgängen auch Verbindungen des vierwertigen Bleis beteiligt sind, konnte noch nicht eindeutig geklärt werden.
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 126-126 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 85-85 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 86-86 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. I 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 98-102 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: The corrosion resistance of the silicides of transitional metalsThe disilicides of Ti, V, Nb, Ta, Cr, Mo and W, as well as Mo5Si3, Mo3Si and W3Si2 have, in general, an extremely high resistance to acids. However, the silicides of Mo and W have a low resistance to most acids whilst the remaining silicides have a high resistance to nitric, hydrochloric and sulphuric acid, but a low resistance to hydrofluoric acid, but a low resistance to hydrofluoric acid. Similar conditions are encountered for hydroazoic acid whilst the resistance of all silicides to NaOH is poor. The high resistance to acids is due to the formation of a surface layer rich in SiO2. To obtain comparable results, the silicides were ground to powder which was then fused in a plasma are into fairly uniform globules.
    Notes: Die Disilicide von Ti, V, Nb, Ta, Cr, Mo und W sowie Mo5Si3 Mo3Si und W3Si2 sind im allgemeinen äußerst beständig gegen Säuren. Schlecht beständig in den meisten Säuren sind die Silicide von Mo und W, während die übrigen Silicide in Salpeter-, Salz- und Schwefelsäure gut, in Flußsäure schlecht beständig sind. Ähnliche Verhältnisse ergeben sich auch für Stickstoffwasserstoffsäure, während in Natriumhydroxid sämtliche Silicide schlecht beständig sind. Die gute Beständigkeit in Säuren beruht auf der Bildung einer SiO2-reichen Oberflächenschicht. Um vergleichbare Ergebnisse zu erhalten, wurden die Silicide nach ihrer Herstellung gemahlen und in einem Plasmabrenner zu ziemlich einheitlichen Kügelchen geschmolzen.
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 119-124 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: The electrode behaviour of zinc and iron in calcium hydroxide solutions and in mortarThe behaviour of zinc (fine zinc and metallurgical zinc) and of unalloyed steel in a saturated calcium hydroxide solution and in mortar has been the subject of electrode-kinetic investigations. The observations showed that the behaviour of fine zinc, metallurgical zinc and galvanized steel is more or less identical, and that even the mortar coating has little effect on the electrode behaviour. It is found that (a)zinc is passivated by a zinc oxide layer;(b)the potential of a short-circuit cell consisting passive zinc and iron becomes so negative that hydrogen is developed at the iron at an appreciable rate;(c)the passivity Of the zinc in a solution containing chloride is removed at a much higher chloride concentration than that of steel.In the case of a galvanized electrode with an electrolytically dissolved layer of pure zinc, the current/potential characteristic was similar to that of the passive iron.
    Notes: Es wurden elektrodenkinetische Untersuchungen über das Verhalten von Zink (Feinzink und Hüttenzink) und von un-legiertem Stahl in gesättigter Calcium-hydroxidlösung und in Mörtel ausgeführt. Die Messungen ergaben, daß sich Feinzink, Hüttenzink und feuerverzinkter Stahl im wesentlichen gleich verhalten und daß auch die Mörtelumhüllung das Elektrodenverhalten kaum verändert. Es wird festgestellt, (a)daß Zink durch eine Zinkoxidschicht passiviert wird,(b)daß das Potential einer Kurzschlußzelle aus passivem Zink und Eisen so negativ wird, daß am Eisen mit merklicher Geschwindigkeit Wasserstoff entwickelt wird,(c)daß die Passivität des Zinks in chloridhaltiger Lösung erst bei wesentlich, höherer Chloridkonzentration aufgehoben wird als die des Stahls.Bei einer feuerverzinkten Elektrode mit elektrolytisch abgetragener Reinzinkschicht war die Stromspannungskurve der des passiven Eisens ähnlich.
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 127-131 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 159-161 
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 171-181 
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 181-181 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 183-194 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Description / Table of Contents: Investigations into the electrolytic-potentiostatic etching of stainless steels in 10 n NaOH, using a coulometerCurrent density/potential characteristics can only provide qualitative indications concerning the phenomena encountered with potentiostatic etching in 10 n NaOH. The process is best carried out in the trans-passive zone. Identification is based, not on the selective dissolution of certain standard components, but on the interference colours which can be observed as a result of the formation of cover layers of different thickness. The charge density/time characteristics also permit quantitative indications of the different phases. Current density/time curves permit a clarification of the mechanism govering the formation of cover layers. A ferritic steel (28 pC Cr) and a NiCr alloy (45 pC Cr) were found to follow a cubic law of growth, whilst CrNi steel 18-8 is initially governed by an approximately logarithmic law, followed by a zone extending over several hours where the growth begins to follow a parabolic law.
    Notes: Stromdichte-Potential-Kurven ermöglichen nur qualitative Aussagen über die Vorgänge beim potentiostatischen Ätzen in 10 n NaOH. Am günstigsten ist Ätzen im Transpassivbereich. Die Identifizierung erfolgt dabei nicht durch selektive Auflösung bestimmter Gefügebestandteile, sondern aufgrund der Interferenzfarben, die infolge der Bildung unterschiedlich starker Deckschichten zu beobachten sind. Die Ladungsdichte-Zeit-Kurven ermöglichen auch Aussagen über die Mengen der einzelnen Phasen. Stromdichte-Zeit-Kurven ermöglichen eine Aufklärung des Deckschichtbildungsmechanismus. Für einen ferritischen Stahl (28% Cr) und eine NiCr-Legierung mit 45% Cr gilt ein kubisches Wachstumsgesetz, während für CrNi-Stahl 18-8 zunächst ein annähernd logarithmisches Gesetz gilt, an das sich ein mehrstündiger Bereich anschließt, in dem übergang zu einem parabolischen Schichtwachstum erfolgt.
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 206-208 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Electro-chemical examination of solutions containing inhibitors for temporary corrosion protectionThe products of lubricant type hitherto mainly used for temporary corrosion protection are increasingly superseded by aqueous solutions. Potentiostatic examinations have shown that solutions containing ammonium oxalate, sodium oxalate or sodium nitrite  -  possibly with an admixture of starch or glycerine  -  are suitable for this purpose. The action mechanism shows fairly great differences. Whilst the inhibiting effect of sodium oxalate is confined to the cathodic reaction, the effect of ammonium oxalate also extends to the anodic reaction. Ammonium oxalate is much more effective than sodium nitrite. It has not yet been possible to establish with certainty whether the protective effect is due to the formation of an oxa-late film, or to the adsorption of the oxalate ions, or to the reaction with oxygen.
    Notes: Statt der bisher meist verwendeten schmierstoffähnlichen Produkte fü den zeitweiligen Korrosionsschutz finden zunehmend wäßrige Lösungen Anwendung. Potentiostatische Untersuchungen haben gezeigt, daß Lösungen mit Ammoniumoxalat, Natriumoxalat oder Natriumnitrit, gegebenenfalls mit Zusatz von Stärke oder Glycerin, für diesen Zweck geeignet sind. Der Wirkungsmechanismus ist ziemlich verschieden. Während Natriumoxalat nur die kathodische Reaktion inhibiert, erstreckt sich die Wirkung von Ammoniumoxalat ist dabei wesentlich wirksamer als Natriumnitrit. Ob die Schutzwirkung bedingt ist durch Bildung einer Oxalatschicht, Adsorption der Oxalation oder Bindung von Sauerstoff, konnte noch nicht eindeutig entschieden werden.
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    Keywords: Chemistry ; Polymer and Materials Science
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    Description / Table of Contents: Electrochemical measuring methods for studying stress-corrosion cracking and corrosion fatigueAn apparatus is described for the investigation of local corrosion phenomena with simultaneous static and dynamic loading. The apparatus enables measurements to be made of potential variations in time, interdependance of current density and potential, and current density variation at constant potential. It is shown that stress corrosion cracking of carbon steel in boiling Ca(NO3)2, solution and of soft iron in NaOH is a clear local corrosion process. Analogous results are obtained with austenitic stainless steel in an activating medium. Corrosion fatigue of passive austenitic steels can be produced in SO, saturated water or in ferroammonium sulphate solution. Between corrosion fatigue and stress corrosion cracking there is a number of analogies but there are also differences. Stress corrosion cracking strongly depends from material composition but may be produced by almost any medium, while corrosion fatigue is possible in certain media only, but is not related with a particular metal composition.
    Notes: Beschrieben wird eine Apparatur zur Untersuchung örtlicher Korrosionserscheinungen bei gleichzeitiger statischer und dynamischer Werkstoffbeanspruchung. Die Apparatur ermöglicht die Messung von zeitlichen Potentialänderungen, der Abhängigkeit von Stromdichte und Potential und der Änderung der Stromdichte bei konstantem Potential. Es wird nachgewiesen, daß die Spannungsrißkorrosion von C-Stahl in Siedender Ca(NO3)2- Lösung und von Weicheisen in NaOH ein ausgesprochener Lokalkorrosionsvorgang ist. Für austenitische nichtrostende Stäble erhält man mit einem aktivierenden Medium analoge Ergebnisse. Schwingungsrißkorrosion passiver austenitischer Stähle kann in mit Schwefeldioxid gesättigtem Wasser oder Ferroammonsulfatlösung der- zeugt werden. Zwischen Schwingungsrißkorrosion und Spannungsrißkorrosion be- stehen zahlreiche Analogien, doch auch Unterschiede. Spannungsrißkorrosion ist stark abhängig von der Werkstoffzusam-mensetzung, kann jedoch durch fast jedes dien möglich ist, jedoch an keine bestimmte rißkorrosion ist nur in bestimmten Medien möglich, ist jedoch an keine bestimmte Metallzusammensetzung gebunden.
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 228-236 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 248-253 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 263-268 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 272-279 
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 279-279 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. IX 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 323-327 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Description / Table of Contents: Investigations into the causes of stress corrosion cracking with stainless, C-stabilized austenitic Cr-Ni-steelsWith the deformation of specimens (steel with 17 per cent. Cr, 10 per cent Ni) in boiling MgCl2 solution, the potential is shifled to the negative side, at a rate which increases with the expansion rate. This phenomenon is ascribed to the fact, that, with slow expansion, the active zones are again apt to be passivated. It is only when major cracks are already present that the expansion rate at the bottom of the crack becomes so high that no passivation takes place any more and that the potential remains continuously below that required for stress corrosion cracking. Between stres corrosion cracking and pitting corrosion, there is a correlation inasmuch as the pitting has a corrosioninhibiting effect. The hydrogen and chlorme ions which accumulate in the pitting have the effect of shifling the potential to the negative side so that, during expansion, the potential is no longer much below the negative potential required for stress corrosion cracking. This interpretation is derived from the different behaviour of specimens which were exposed to loads after brief polarisation (causing pitting corrosion), and directly.
    Notes: Bei der Verformung von Proben (Stahl mit 17 % Cr, 10 % Ni) in siedender MgCl2-Lösung wird das Potential unedler, und zwar zunehmend mit der Dehnungsgeschwindigkeit. Diese Erscheinung wird damit gedeutet, daß bei langsamer Dehnung die aktiven Bereiche wieder passiviert werden können. Lediglich wenn schon größflere Risse vorliegen, wird die Dehngeschwindigkeit am Rißgrund so hoch, daß dort keine Passivierung mehr auftritt und das für Spannungsrißkorrosion erforderliche Potential dauernd unterschritten wird. Zwischen Spannungsrißkorrosion und Lochfraß besteht insofern eine Beziehung, als die Löcher korrosionsverzögernd wirken. Die Wasserstoff- und Chlorionen, die sich in den Löchern ansammeln, verschieben das Potential zu negativen Werten, so daß bei Dehnung das für die Spannungsrißkorrosion erforderliche negative Potential kaum noch unterschritten wird. Diese Deutung ergibt sich aus dem unterschiedlichen Verhalten von Proben, die nach kurzer Vorpolarisation (Lochfraßauslosung) und direkt belastet wurden.
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 355-366 
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 370-372 
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969) 
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. XIII 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 396-407 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Description / Table of Contents: Passivation behaviour and stress corrosion cracking of iron-maganese-chromium alloys in sodium chloride solutionElectrochemical experiments with MnCr steels (20-28% Mn, up to 12% Cr) in 3% NaCl solution. High Mn contents reduce the passivation tendency, while increasing Cr contents broaden the range of passivity. The formation of surface layers is due primarily to a direct reaction with the solution (good adhesion, high protective value) and, secondarily, to precipitation from the solution (porosity, low protective value). The tendency to form secondary layers increases as the Cr content is reduced. In oxygen containing solution there is a pronounced corrosion in the pitting range. At low Cr contents, stress corrosion cracking is mostly transcrystalline, at higher Cr contents (8-12%) it is intercrystalline, in particular when Cr carbide precipitations are present at the grain boundaries. In the range of transcrystalline corrosion the susceptibility to selective corrosion extends beyond the pitting potential. At higher Cr contents there may be pitting without any indication of stress corrosion cracking.
    Notes: Electrochemische Versuche mit MnCr-Stählen (20-28% Mn, bis 12% Cr) in 3% NaCl. Hohe Mn-Gehalte verringern die Passivierungsneigung, während steigende Cr-Gehalte den Passivitätsbereich verbreitern. Die Deckschichtbildung erfolgt hierbei primär durch direkte Reaktion mit der Lösung (gute Haftung, hoher Schutzwert), sekundär durch Ausfällen aus der Lösung (Porosität, geringer Schutzwert). Die Neigung zur Bildung sekundärer Schichten steigt mit abnehmendem Cr-Gehalt. In sauer-stoffhaltigen Lösungen tritt ausgeprägte Korrosion im Lochfraßbereich auf. Bei niedrigen Cr-Gehalten verläuft Spannungsrißkorrosion meist transkristallin, bei höheren Cr-Gehalten (8-12%) interkristallin, besonders wenn an den Korngrenzen Auscheidungen von Cr-Carbid vorliegen. Im transkristallinen Korrosionsbereich ist die Anfälligkeit für selektive Korrosion über das Lochfraßpotential hinaus erweitert. Bei höheren Cr-Gehalten kann Lochfraß auftreten, ohne daß Anzeichen einer Spannungsriß-korrosion vorliegen.
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 436-438 
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 452-454 
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 339-340 
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 333-339 
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 366-368 
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 518-522 
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 530-532 
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 555-561 
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 569-569 
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 569-569 
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 486-487 
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 578-583 
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    Description / Table of Contents: Cathodic corrosion of lead in the soilCathodic corrosion of lead in the soil can be expected in exceptional cases only. The corrosion found on a particular lead cable could be simulated in the laboratory. It could be confirmed, that  -  probably by decomposition of primary lead hydride  -  metallic lead is deposited below layers of Ca and Mg compounds already at potentials below -1,7 V. A special switching method was developed to account for breakthrough polarisation.
    Notes: Kathodische Korrosion von Blei im Boden ist grundsätzlich nur in Ausnahmefällen zu erwarten. Diese an einem Kabel gefundene Korrosion wurde im Laboratorium nachgebildet. Hierbei konnte bestätigt werden, daß unter Deckschichten aus Calcium- und Magnesiumverbindungen bei Potentialen schon unter -1,7 V metallisches, Blei abgeschieden wurde, wahrscheinlich durch Zersetzung von primär entstandenem Bleihydrid. Für derartige Untersuchungen wurde eine spezielle Schaltmethode entwickelt, bei welcher auch die Durchtrittspolarisation berücksichtigt wird.
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 583-595 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Description / Table of Contents: Destruction of high purity aluminium, zinc and plexiglass by flow cavitationCavitation in cold and warm water produces a strengthening of aluminium during a first incubation period, although fine cracks are already formed which induce erosion. It is for this reason that cathodic protection remains without effect. The same applies to Zn which undergoes a limited translation (because of its lower plasticity) and twin formation and, later on, erosion. Plexiglass absorbs water, while cracks starting at weak spots in the structure induce erosion and fatigue cracks are formed later on. The second stage of cavitation is characterized by high weight losses, connected with strong changes in the material surface, while in the third stage decreasing weight losses can be found. This decrease is attributed to the fact, that the water formed by bubble implosion in cracks cannot flow out easily and thus forms a sort of protective cushion.
    Notes: Al wird während einer Inkubationsperiode durch Kalt- und Warmwasserkavitation mechanisch verfestigt, doch bilden sich schon feine Risse, welche die Erosion einleiten. Aus diesem Grunde ist kathodischer Schutz unwirksam. Gleiches gilt für Zn, bei dem es zunächst zu begrenzter Translation und Zwillingsbildung, später zu Erosion kommt. Plexiglas nimmt Wasser auf, wobei durch Erosion an schwachen Gefügestellen Erosion eingeleitet wird und später Ermüdungsrisse auftreten. Der zweite Bereich ist charakterisiert durch hohe Gewichtsverluste, verbunden mit starker Veränderung der Werkstoffoberfläche, während im dritten Stadium wieder eine Abnahme der Gewichtsverluste festzustellen ist. Diese Verringerung dürtle darauf zurückzuführen sein, daß das durch Implosion von Blasen in den Rissen entstehende Wasser dann nicht mehr leicht abfließen kann und so eine Art Schutzpolster bildet.
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 595-601 
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    Description / Table of Contents: Intercrystalline corrosion of the nickel alloy NiCr 20 TiAlThe corrosion behaviour of NiCr 20 TiAl shows a clear dependence from the carbon content. In Strauss solution the alloys containing 0.007% C are not susceptible to intercrystalline corrosion, while with carbon contents of 0.036 to 0.078% intercrystalline corrosion occurs similar to that in 18-8 steels. In boiling nitric acid the corrosion susceptibility further depends from the heat treatment. After cooling from the temperature of solution annealing in air high weight losses are found which even increase after ageing, while they are reduced by quenching in water and then can be found with the alloys having higher carbon contents only. The intercrystalline corrosion is attributed to a formation at the grain boundaries.
    Notes: Das Korrosionsverhalten von NiCr 20 TiAl ist stark abhängig vom C-Gehalt. In Straußscher Lösung neigen die Legierungen mit 0,007% C nicht zu interkristalliner Korrosion, während bei C-Gehalten von 0,036 bis 0,078% C interkristalline Korrosion ähnlich wie im Falle der 18/8-stähle eintritt. In siedender Salpeteräure ist die Korrosionsanfälligkeit auch noch stark von der Wärmebehandlung abhängig. Nach Abkühlen von der Temperatur des Lösungsglühens an der Luft treten hohe Gewichtsverluste auf, die nach Auslagern noch steigen, bei Abschrecken in Wasser hingegen wesentlich geringer sind und dann nur bei den höheren Kohlenstoffgehalten festgestellt werden können. Als Ursache für die Chromverarmung an den Korngrenzen infolge Carbidbildung angesehen.
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 617-627 
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 635-640 
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 640-641 
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 649-650 
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 570-570 
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    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: The electrochemical behaviour of titaniumCurrent-potential curves established in 6 N sulfuric acid show at -0,45 V the formation of a passive layer of titanium hydride and Ti-O (oxygen content 0 to 1.0). In the subsequent range of 200 mV this layer is converted into a passive layer of the n-conductor and which consists of TiO2 with a little Ti3O5. In NaOH (1.0 and 6.0 N) a layer consisting exclusively of TiO2 is formed above -0.614 V, and above 1.8 V there is evolution of oxygen. The results are interpreted in terms of thermodynamics. The rest potential requires considerable time for reaching its stationary value, depending on the state of the surface and the moisture content of the electrode.
    Notes: In 6 n H2SO4 aufgenommene Strom-Spannung-Kurven zeigen bei -0,45V das Entstehen einer Passivschicht aus Ti-Hydrid und Ti-O (Sauerstoffgehalt 0 bis 1,0). In den anschließenden 200mV wandelt sich diese Schicht um in eine Passivschicht, die n-leitend ist und aus TiO2 mit etwas Ti3O5 besteht. In NaOH (1,0 n, 6,0 n) entsteht ab -0,614 V eine ausschließlich aus TiO2 bestehende Schicht, ab 1,8 V tritt Sauerstoffentwicklung auf. Die Einstellung des Ruhepotentials erfordert ziemlich lange Zeit abhängig von Oberflächenzustand und Feuchtigkeitsgehalt der Elektrode.
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 694-696 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 711-716 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 641-644 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 732-732 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 604-612 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 613-616 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 627-633 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 644-649 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 98
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 651-658 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: The behaviour of Pt/PtRh and Ni/NiMo thermal elements in the high temperature vacuum furnace in the presence of material containing chromiumDuring annealing under vacuum (10-3 to 10-4 Torr) at temperatures exceeding 1200° C, it is always necessary to reckon with the evaporation of Cr from the built-in parts of the furnace (highly alloyed steels). The evaporated Cr is, inter alia, deposited on the thermo-elements, affecting their thermal potentials and reducing their service life, due to the formation of hard and brittle inter-metal compounds. A remedy consists in the use of vacuum-tight thermo-element protection tubes (which admittedly gives rise to a certain inertia of indication) or in the reduction of the vacuum through the addition of nitrogen as soon as a temperature of 1000° C is exceeded. It is also recommended to use ceramic components or those consisting of Mo plates without Cr content.
    Notes: Bei Glühen unter Vakuum (10-3 bis 10-4 Torr) bei über 1200° C ist immer mit Verdampfen von Cr aus den Einbauteilen des Ofens (hochlegierte Stähle) zu rechnen. Das verdampfte Cr lagert sich u. a. auf den Thermoelementen ab, verändert deren Thermospannung und verkürzt deren Lebensdauer, und zwar infolge der Bildung harter und spröder intermetallischer Verbindungen. Abhilfe besteht in der Verwendung vakuumdichter Thermoelementschutzrohre (was allerdings zu einer gewissen Trägheit der Anzeige führt) oder in der Verringerung des Vakuums mittels Zusatz von Stickstoff, sobald 1000° C überschritten werden. Zu empfehlen ist auch die Verwendung von Einbauteilen aus Keramik oder aus Mo-Blechen ohne Cr-Gehalte.
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    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 658-665 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: The correlation between cavitation rate and the water temperature with the flow cavitation of effluentsCavitation in flowing water has two harmful components: mechanical and chemical damage. Mechanical damage decreases with increasing water temperature; in contrast, the corrosive effect increases greatly above 35° C. However, since plastics are not affected by electro-chemical corrosion, this component can here be neglected so that the cavitation of plastics decreases with increasing temperature. With higher temperatures, the incipient softening process will also play a part which is reflected in a change in the appearance of the separated particles. In the case of metals  -  here aluminium  -  the corrosion component cannot be neglected, i.e., after a minimum of 35° C, the cavitation increases again.
    Notes: Kavitation in strömendem Wasser setzt sich zusammen aus zwei Schadenskomponenten: mechanische und chemische Schädigung. Die mechanische Schädigung nimmt mit steigender Wassertemperatur ab, die korrosive Wirkung nimmt oberhalb 35° C beträchtlich zu. Da indessen bei Kunststoffen nicht von einer elektrochemischen Korrosion gesprochen werden kann, wird diese Komponente hier vernachlässigbar, d. h. daß die Kavitation von Kunststoffen mit steigender Temperatur abnimmt. Bei höheren Temperaturen spielt dann auch die beginnende Erweichung eine Rolle, was sich in einer Veränderung des Aussehens der abgetrennten Teilchen äußert. Im Falle von Metallen  -  hier Al  -  ist die Korrosionskomponente nicht zu vernachlässigen, d. h. daß die Kavitation nach einem Minimum bei 35° C wieder zunimmt.
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