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  • Polymer and Materials Science  (3,775)
  • 1955-1959  (3,775)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 624-630 
    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 mechanism of anaerobic microbiological corrosion of metals in soilIn order to investigate the mechanism of anaerobic micro-biological corrosion of iron in the soil, the authors have carried out electro-chemical model tests. These showed that the cathodic depolarisation is accompained by an anodic depolarisation, which has been investigated in detail as to its cause and progress, and its effect on the formation of the protective layers. Moreover, since a potential is set up between those parts of the surface which are affected by anaerobic bacteria and those which are not, long-distance currents are generated which give rise to strong local corrosion at ferrous building components in the soil. Finally, the corrosion of metals in the soil is also decisively influenced by the alternation of oxidizing and reducing conditions and by the mutually complementary activities of oxidizing and reducing micro-organisms.
    Notes: Zur Aufklärung des Mechanismus der anaeroben mikrobiologischen Korrosion des Eisens im Erdreich führten die Verfasser elektrochemische Modellversuche durch. Diese ergaben, daß gleichzeitig mit der kathodischen Depolarisation auch eine anodische Depolarisation auftritt, deren Ursache, Verlauf und Auswirkung auf die Ausbildung von Schutzschichten eingehend verfolgt wurden. Da weiter zwischen Oberflächenpartien, die unter dem Einfluß anaerober Bakterien stehen und solchen, die frei von diesen Bakterien sind, Potentiale entstehen, treten Langstreckenströme auf, die zu starken örtlichen Anfressungen an eisernen Bauteilen im Erdreich führen. Schließlich übt auch der zeitliche Wechsel der oxydierenden und reduzierenden Bedingungen und die einander ergänzende Lebenstätigkeit oxydierender und reduzierender Mikroorganismen einen entscheidenden Einfluß auf die Korrosion der Metalle im Erdreich aus.
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  • 2
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 661-661 
    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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  • 3
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 662-663 
    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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  • 4
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. XXVI 
    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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  • 5
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 666-668 
    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: Kinetics of the dissolution of copper, and graphic presentation of its performance by means of corrosion current pH diagramsThe dissolution of electrolylic copper in electrolytes has been investigated by observing the corrosion current io. The dissolution rate in 0,25 n-NaCl and 0,25 nKH2PO4 is governed by the exponential relationships io = 0,20·t1,67 and io = 0,08 · t0,695, respectively. The dissolution rate in 0,5 n-KNO, is governed by the linear relation io = 0,08 · t, where t is the duration of the test. Thc present paper is exclusively concerned with the graphic presentation of the performance af electrolytic copper and brass 70 in the form of the corrosion current/PH diagram.
    Notes: Der Auflösungsvorgang des Elektrolytkupfers in Elektrolyten wurde anhand des Korrosionsstroms i0 verfolgt. Für die Auflösungsgeschwindigkeit in 0,25 n-NaCl und 0,25 n-KH2PO4 gelten die exponentiellen Beziehungen: i0 = 0.20 . t1.67, bzw. i0 = 0.08 . t0.695, und in 0.5 n-KNO3 gilt die lineare Beziehung i0 = 0.08 . t, wobei t die Versuchsdauer bedeutet.Der vorliegende Beitrag bringt die graphische Darstellung der Korrosion des Elektrolytkupfers und Messings M 70 in Form des Korrosionsstrom-pH-Diagramms.
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  • 6
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 779-780 
    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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  • 7
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 564-572 
    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: Laboratory Equipment mode of High-Stability PlatinumIn an effort to improve the mechanical resistance and dimensional stability of platinum laboratory equipment without impairing its chemical resistance, platinum has been alloyed with a few per cent of gold. In the annealed condition, this alloy, known as “Crucible Platinum II”, has twice the tensile strength of normal crucible platinum, not only at room temperature but even at temperatures as high as 1000°C. Practical experience, extending over several years, with crucibles and dishes in numerous analytical laboratories has shown that equipment made of “Crucible Platinum II”, has excellent shape stability, without being in any way inferior to normal crucible platinum as for as its chemical resistance is concerned. By means of statistical data, the weight constancy of the new alloy is compared with that of normal crucible platinum, after being used for normal analytical ignition and fusing tests, and after exposure to acids.
    Notes: In dem Bestreben, die mechanische Widerstandsfähigkeit und Formbeständigkeit von Laboratoriumsgeräten aus Platin zu verbessern unter voller Erhaltung ihrer chemischen Beständigkeit, wurden dem Platin einige Prozent Gold zulegiert. Dieses “Geräteplatin II” besitzt im geglühten Zustand nicht nur bei Raumtemperatur, sondern auch noch bei 1000°C eine doppelt so hohe Festigkeit als normales Geräteplatin. Während mehrjähriger Erprobung von Tiegeln und Schalen in zahlreichen analytischen Laboratorien hat sich erwiesen, daß Geräte aus dem neuen “Geräteplatin II” eine ausgezeichnete Formbeständigkeit haben und dabei hinsichtlich ihrer chemischen Beständigkeit dem normalen Geräteplatin nicht nachstehen. Es wurden vergleichende Daten für die Gewichtskonstanz von Geräten aus normalem und aus formbeständigem Geräteplatin bei den üblichen analytischen Glüh- und Schmelzoperationen sowie bei der Einwirkung von Säuren mitgeteilt.
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  • 8
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 589-589 
    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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  • 9
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 596-596 
    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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  • 10
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 654-654 
    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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  • 11
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 663-664 
    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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  • 12
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959) 
    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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  • 13
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. XXXI 
    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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  • 14
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 800-800 
    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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  • 15
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    Materials and Corrosion/Werkstoffe und Korrosion 6 (1955), S. 463-463 
    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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  • 16
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 6 (1955), S. 463-464 
    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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  • 17
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 6 (1955), S. 464-467 
    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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  • 18
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 11-13 
    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: What about the Protection against RustMill cinder must be removed because of its proved unreliable behavior before any protective measures are taken. For preliminary steel priming pure minium or minium „V40“ should be used as these primings might remain on the surface of the steel. - The German Federal Railways (Bundesbahn) do not permit the use of blends except minium „V40“. - Phtalic acid resin binders are gaining increasing importance for underwater varnishing. - Real passivating agents must contain a sufficient amount of active oxygen. - Even paints which are rich in lead can be sprayed without danger if the official security regulations are complied with. - The durability is and will always be the single reliable determination of the quality of a paint.
    Notes: Die Walzhaut ist infolge ihrer erwiesenen Unzuverlässigkeit vor Beginn der eigentlichen Schutzmaßnahmen zu entfernen. Auch die „vorläufigen“ Stahlgrundierungen werden am besten mit reiner Bleimennige oder Bleimennige V40 ausgeführt, die dauernd auf der Stahlfläche verbleiben können. Mit Ausnahme der Bleimennige V40 sind bei der Bundesbahn nach wie vor keinerlei Verschnitte zugelassen. Im Unterwasser-Anstrich gewinnen die Phthalatharz-Bindemittel zunehmend an Bedeutung. „Echte“ Passivierungsmittel müssen genügend „aktivierbaren“ Sauerstoff enthalten. Bei Einhaltung der behördlichen Sicherheits-Vorschriften können auch bleireiche Anstrichstoffe gefahrlos im Spritzverfahren aufgetragen werden. Die Lebensdauer ist und bleibt der einzig zuverlässige Wertmesser für Anstrichstoffe.
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  • 19
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 1-6 
    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: Investigations on the Changing of the Properties f Water by Weak Direct CurrentsWeak direct currents of a certain tension which are applied to hot water supply and heating installations are well known to prevent the corrosion of the walls being in touch of water if the supply points are not too far away. Today nobody denies any more the existence of this cathodic protection though its mechanism has not yet been cleared. For more than twenty years experts assert that weak direct currents would alter the chemical behavior of water so that aggressive water becomes unaggressive and scale depositing water would lose this property. This has always been controverted. But as the latter maintaining could be confirmed by many practical experiences in working plants and as there is no explanation for such an effectiveness of weak direct currents investigations were carried out in working hot water supply and heating installations protected by weak direct currents. These experiments had to clear the change of the properties of the water and whether the result would allow to explain the anti-corrosive and anti-scale effectiveness of weak cathodic currents. This article contains the hitherto obtained results of these investigations.
    Notes: Es ist bekannt, daß schwacher, niedrig gespannter Gleichstrom bestimmter Stärke, der in Warmwasserversorgungs- und Heizungsanlagen an geeigneter Stelle künstlich eingeführt wird, Korrosion auf den wasserberührten Wandungen dieser Anlagen, soweit deren Entfernung von der Stromeinführungsstelle ein bestimmtes Maß nicht überschreitet, zu verhüten vermag. Das Vorhandensein dieses „kathodischen Schutzes“ wird heute nicht mehr bestritten, wenn man auch sein wahres Wesen bis jetzt noch nicht klar erklären kann. Bestritten wird aber noch immer die sei etwa 20 Jahren von Praktikern aufgestellte Behauptung, daß schwacher, niedrig gespannter Gleichstrom die chemische Beschaffenheit des vom Strom durchflossenen Wassers so zu verändern vermag, daß von Natur aggressives Wasser nicht aggressiv wird und steinbildendes Wasser die Steinbildungsfähigkeit verliert. Weil nun diese letztere Behauptung durch viele praktische Erfahrungen in betriebenen Anlagen bestätigt wird, aber Gründe für die behauptete Wirksamkeit des schwachen Gleichstroms bisher nicht erkennbar sind, wurden Untersuchungen in betriebenen, durch Aufprägung von schwachem Gleichstrom geschützten Warmwasserversorgungs- und Heizungsanlagen durchgeführt, die zunächst feststellen sollten, worin diese Veränderung besteht, und ob sie die korrosions-und steinverhütende Wirkung von künstlich aufgeprägtem schwachen Gleichstrom erklären kann. Der vorliegende Aufsatz enthält die bisherigen Ergebnisse dieser Untersuchungen.
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  • 20
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 31-36 
    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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  • 21
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 13-16 
    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 Reactions between CuO and Fe resp. Fe3O4 in Solid State and their O2 and Water Vapor InfluencesThe reaction of CuO with Fe is detectable by means of the heating curves method at a temperature of at least 193°C. This reaction is activated by oxygen. Under these conditions it starts at lower temperatures but runs as if there would be no oxygen. Oxygen and water vapor are capable to increase suddenly the rate of reaction so that high temperatures appear. Under the same conditions but in absence of these two gases the reaction proceeds at a slow rate. CuO reacts upon Fe3O4 in a similar way. The heating curve of this reaction shows but no maximum.The formation of metallic copper and the local appearance of high temperatures are of considerable importance for the practice of steam plants. The formation of Fe2O3 by the reaction between CuO and Fe3O4 is just as well important for the determination of the type of corrosion.
    Notes: Die Umsetzung von CuO mit Fe ist nach der Methode der Erhitzungskurven schon ab 193° C nachweisbar. Diese Reaktion wird durch O2 angeregt, so daß sie dann bei niedrigeren Temperaturen beginnt und abläuft als bei Abwesenheit von Sauerstoff. O2 und H2O-Dampf sind in der Lage, die Reaktion plötzlich ablaufen zu lassen, so daß hohe Temperaturen entstehen, während sie bei Abwesenheit dieser beiden Gase unter gleichen Reaktionsbedingungen langsam verläuft. Ähnlich wie mit Fe reagiert CuO auch mit Fe3O4. Bei dieser Reaktion tritt aber kein Maximum in der Erhitzungskurve auf.In Bezug auf die Praxis im Dampfbetrieb ist die Entstehung von metallischem Kupfer von Bedeutung und die Tatsache, daß hohe örtliche Temperaturen auftreten können. Die Entstehung von Fe2O3 durch die Umsetzung zwischen CuO und Fe3O4 ist für die Beurteilung von Korrosionen ebenfalls von Bedeutung.
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 46-46 
    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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  • 23
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 52-52 
    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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  • 24
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 64-64 
    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 7 (1956), S. 65-82 
    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: A Survey of the Methods and Specifications of Accelerated Tests in the Climatic Testing ProcedureThe methods of the accelerated tests for climatic testing, published in the German and foreign literature especially in the literature of standards, are reviewed in chart form. The material is classified according to the following points of view: 1conditioning prior to test,2constant climates (cold, dry, heat, high relative humidity),3special wearing (immersion, salt mist, mould growth, etc.),4alterating climate (changing of temperature, condensation),5Combined test cycles (alterating condensation in an atmosphere containing sulphur dioxide, light with additional effects, etc.).
    Notes: In Form von tabellarischen Übersichten werden die in der deutschen und ausländischen Literatur, insbesondere der Normenliteratur, beschriebenen Kurzbeanspruchungsverfahren im Rahmen der Klimaprüfung zusammenfassend dargestellt. Der Stoff ist nach folgenden Gesichtspunkten gegliedert: 1Klimabedingungen vor der Prüfung2Konstantklimate (Kälte, trockene Wärme, hohe Luftfeuchtigkeit.)3Sonderbeanspruchungen (Wasserlagerung, Salzsprühnebel, Schimmel usw.)4Wechselklima (Temperaturwechsel, Betauung usw.)5Kombinierte Prüfzyklen (Wechselbetauung in einer Atmosphäre, die Schwefeldioxyd enthält, Licht mit zusätzlichen Einflüssen usw).
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 127-137 
    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: Material Secting Viewpoints for Contact Catalysts. Part II. Behavior and Properties of semiconducting CatalystsCondensed from the late literature non metal contact agents of the heterogenous catalysis are reviewed with respect to their semiconducting properties. By means of numerous works of different sources a causality between catalytic activity and electronic disturbances could be proved. In the discussion of some special types of reaction-decomposition of N2O, H2O2, O3, oxidation of CO, SO2, NH3, numerous reactions of hydrogenation, dehydrogenation, dehydration and some rearrangements and cleavages of organic molecules-two general kinds of reaction were created. Donator reactions forming kations of the reactants at a measurable rate on the surface of the contact during the course of reaction, are catalysed well by p-conducting agents. Acceptor reactions, characterized by a formation of anions in the velocity terminating intermediate reactions, are catalysed favorably by n-conductors.Electronic disturbances will always be ineffective if an innermolecular rearrangement, proceeding without any electron transition to or from the contact, becomes termitating velocity of reaction. By means of the semiconducting properties many causalities between the catalytic activity and the material properties of the contacts can be deduced for numerous contacts and reactions. The causalities, however, are of qualitative character and limited validity as the essential factors for catalytic reactions can only be demonstrated exactly with regard to the surface bonds of the activated complex (intermediate state).
    Notes: Nichtmetallische Kontaktmassen der heterogenen Katalyse werden vom Blickwinkel ihrer Halbleitereigenschaften aus in Form einer Zusammenfassung neuerer Literatur betrachtet. An Hand zahlreicher Arbeiten aus verschiedensten Quellen kann gezeigt werden, daß zwischen der katalytischen Wirksamkeit und der elektronischen Fehlordnung der Kontakte kausale Zusammenhänge bestehen. Bei der Besprechung einzelner Reaktionstypen - des N2O-Zerfalls, der CO-Oxydation, des H2O2-Zerfalls, des Ozonzerfalls, der SO2-Oxydation der NH3-Oxydation, zahlreicher Hydrierungs-, Dehydrierungs- und Dehydratisierungsreaktionen und einiger Umlagerung- und Spaltreaktionen organischer Molekeln-wird zwischen zwei Reaktionsarten unterschieden. DONATOR-Reaktionen, die während des Reaktions-Ablaufs mit meßbarer Geschwindigkeit Kationen der Reaktanten an der Katalysatoroberfläche ausbilden, werden durch p-leitende Katalysatoren gut katalysiert. AKZEPTOR-Reaktionen, gekennzeichnet durch eine Anionenausbildung im geschwindigkeitsbestimmenden Teilschritt der Reaktion, werden durch n-Leiter bevorzugt katalysiert.Ohne Einfluß ist die Fehlordnung immer dann, wenn Umlagerungen innerhalb der Molekeln, die ohne einen Elektronenübergang zum (oder vom) Katalysator verlaufen, geschwindigkeitsbestimmend werden.Mit Hilfe der Halbleitereigenschaften lassen sich für zahlreiche Kontakte und Reaktionen Zusammenhänge zwischen katalytischer Wirksamkeit und den Stoffeigenschaften des Kontaktes herleiten. Diese Zusammenhänge tragen jedoch nur qualitativen Charakter und sind nur beschränkt gültig, da die für die katalytische Reaktion wesentlichen Faktoren nur durch die Oberflächenbindung des aktivierten Komplexes (Zwischenzustandes) streng dargestellt werden können.
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 168-170 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 177-181 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 183-187 
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    Materials and Corrosion/Werkstoffe und Korrosion 6 (1955), S. 48-51 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 189-198 
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    Description / Table of Contents: Systematic Investigations to Test the Anticorrosive Efficacy of VPI upon a number of common MetalsIndustry pays increasing attention to Vapor Phase Inhibitor protection against corrosion. Thus far the application of this method was limited to steel products chiefly where excellent results could be expected in any case. In the course of this work the behavior of many common metals and alloys upon VPI were investigated systematically. The experiments made certain that the corrosive effect of atmospheric influences upon iron and non ferrous metals could be prevented. Herewith exact datas are available for the interested branches of industry so that they could make use of the numerous advantages of the VPI method.
    Notes: Der Korrosionsschutz mittels „Vapor Phase Inhibitor“ findet in der Industrie immer stärkere Beachtung. Bislang beschränkte sich die Anwendung dieses Verfahrens hauptsächlich auf Stahlerzeugnisse, bei denen in jedem Fall vorzügliche Ergebnisse zu erwarten sind. In der vorliegenden Arbeit wurden die Verhaltensweisen auch anderer viel verwendeter Metalle und Metallegierungen gegen VPI systematisch untersucht. Es wurde nachgewiesen, daß die korrodierende Wirkung atmosphärischer Einflüsse auch bei Eisen- und Nichteisenmetallen verhindert werden kann. Den einschlägigen Industrie-zweigen stehen damit exakte Unterlagen zur Verfügung, so daß nun auch dort die vielfachen Vorteile des VPI-Verfahrens nutzbringend angewendet werden können.
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    Materials and Corrosion/Werkstoffe und Korrosion 6 (1955), S. 53-55 
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    Materials and Corrosion/Werkstoffe und Korrosion 6 (1955), S. 55-56 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 235-238 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 241-242 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 224-225 
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    Materials and Corrosion/Werkstoffe und Korrosion 6 (1955), S. 63-71 
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    Description / Table of Contents: On Alternating-Current-CorrosionLaboratory-experiments on the destruction of iron-electrodes being charged with direct and alternating and indulatory currents are communicated. The results are compared with the theory. Conclusions for the practice of stray-current-corrosion are drawn.The experiences of electric works concerning the destruction of earth-circuits made of different metals are related. The apparent influence of stray-current-charges on earth-circuits is explained. According to the obtained results the author recommends a prohibition of coppermade-earth-circuits.
    Notes: Es wird von Laboratoriumsversuchen über die Zerstörung von Eisenelektroden bei Gleichstrom-, Wechselstrom- und Mischstrom-Belastung berichtet. Die Versuchsergebnisse werden mit der Theorie verglichen und Schlußfolgerungen für die Praxis der Streustromkorrosion gezogen.Es wird sodann zu praktischen Erfahrungen it Zerstörung von Erdern aus verschiedenem Material in Elektrizitätswerksbetrieben übergegangen und eine Deutung des scheinbaren Einflusses der Streustrombelastung auf Erder gegeben.Auf Grund dieser Ergebnisse wird ein Verbot der Verwendung von Kupfer als Baumaterial empfohlen.
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 285-291 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 294-299 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 303-303 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 304-304 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. I 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 335-337 
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    Materials and Corrosion/Werkstoffe und Korrosion 6 (1955), S. 72-80 
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    Description / Table of Contents: The To-Day State of Phosphatizing on Iron and Non-Ferrous-MetalsPhosphatizing is a electrochemical, cathodically controlled process. The author developed mathematical lawfulness for the formation and decomposition of phosphate-covers which was proved by experiments. The porosity of the covers was determined to be 0.3% of the total surface. Because of their high porosity phosphate-covers are used only in combination of oils, lacquers or varnishes. The methods of phosphatizing are discribed in detail. According to the composition of the phosphatizing bath or the intensity of treatment, thinner or thicker covers are obtained. Thick covers of more than 100 mg/100 cm2 (on nails, screws, etc.) are oiled while thin covers of 25-75 mg/100 cm2 are bottoms for painting.Phosphate-covers do not only serve protection against corrosion but also the decrease of friction of sliding surfaces of machines. These covers of manganese and iron phosphate are applied in combination with lubricants.Phosphatizing is of big importance to the cold-working of iron and steel e. g. to deep-drawing. This method invented by Fr. Singer has been applied in Germany. Later than 1947 it was introduced in Great-Britain and the USA.
    Notes: Der Phosphatierungsprozeß ist ein elektrochemischer, kathodisch gesteuerter Vorgang. Für die Kinetik der Bildung und Zerstörung der Phosphatschichten wurden von w. Machu mathematische Gesetzmäßigkeiten abgeleitet und experimentell bewiesen. Die Porosität der Phosphatschichten wurde zu 0.3% der Gesamtfläche ermittelt. Wegen dieser verhältnismäßig hohen Porosität werden die Phosphatüberzüge nur in Verbindung mit Ölen, Lacken oder Anstrichen verwendet. Die Verfahren der Phosphatierung werden im einzelnen beschrieben.Je nach Zusammensetzung des Phosphatierungsbades oder der Behandlungsintensität erhält man dickere oder dünnere Überzüge. Dicke Schichten von über 100 mg/dm2 für Nägel, Schrauben u. dgl. werden geölt, während die dünnen Schichten von 25-75 mg/dm2 die Grundlage von Anstrichen bilden.Neben dem Korrosionsschutz dienen die Phosphatüberzüge auch zur Verminderung der Reibung von aufeinandergleitenden Maschinenteilen. Diese Schichten aus Mangan- und Eisenphosphaten werden in Verbindung mit Schmiermitteln angewendet.Neben Hilfsmittel bei der Kaltbearbeitung von Eisen und Stahl, z.B. Beim Tiefziehen, ist die Phosphatierung von besonderer Bedeutung. Dieses von Fr. Singer 1935 erfundene und in Deutschland angewendete Verfahren wurde erst nach 1947 in USA und in England eingeführt.
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 353-353 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 358-359 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 359-359 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 366-371 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 372-372 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 391-400 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 390-391 
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    Description / Table of Contents: A Corrosion Resisting Separator Column Made of Monel for the Extraction of MercaptanThere is a treatise about a separator column for the regeneration of caustic soda methanol - mercaptan - solutions in the refinery of the Lobitos Oilfields Ltd., Ellesmere Port, which is using the Unisol process developed by the Universal Oil Products Company. The column was manufactured by the Metal Propellers Ltd. and is made of monel which meets all requirements of an corrosion resisting material.
    Notes: Es erfolgt die Beschreibung einer Abscheidesäle für die Regenerierung von Ätznatron-Methanol-Mercaptan-Lösungen in der Raffinerie der Lobitos Oilfields Ltd., Ellesmere Port, welche nach dem von der Universal Oil Products Company entwickelten Unisol-Prozess arbeitet. Die Säule wurde von der Metal Propellers Lt. aus Monel hergestellt. Es wird gezeigt, daß Monel in Korrosionstechnischer Hinsicht allen Anforderungen als Werkstoff gewachsen ist.
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 416-420 
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    Description / Table of Contents: Corrosion and Heat of ActivationThe rate of corrosion of water and vapor on iron follows the Arrhenius equation. \documentclass{article}\pagestyle{empty}\begin{document}$$k = k_m \cdot e^{ - \frac{Q}{{R \cdot T}}}$$\end{document} as proved by experiments. The heat of activation Q depends on the nature of the material and the phases of the water and of the dissolved electrolytes. The Author refers to similar interpretations by Matthaes on the corrosion of aluminium and of steel caused by different corrosive agents and tries to explain deviations of this rule.
    Notes: Es wird nachgewiesen, daß die Geschwindigkeit des Angriffes von Wasser und Dampf auf Eisen der Gleichung von Arrhenius \documentclass{article}\pagestyle{empty}\begin{document}$$k = k_m \cdot e^{ - \frac{Q}{{R \cdot T}}}$$\end{document} folgt. Die Aktivierungswärme Q ist von der Art des Werkstoffes, den Phasen des Wassers und von den im Wasser gelösten Elektrolyten abhängig. Auf ähnliche Versuchsauswertungen von Matthaes über den Angriff auf Aluminium und verschiedener Angriffsmittel auf Stahl wird, hingewiesen. Es wird versucht, Abweichungen von der Gesetzmäßigkeit zu deuten.
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 602-606 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. I 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 626-628 
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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: Studies on the Corrosion of IronThere are two different modifications of iron oxides. The first is ferromagnetic having p-structure while the second is paramagnetic and has a α-structure. The formation of p-iron rust takes place in moist air. α-iron rust is formed by aqueous solutions of strong oxidising reagents or by organic agents. The magnetic behavior of the iron oxides allows to reconstruct the conditions of their formation. The results of the magnetic test comply with those of the X-ray fine structure investigations.
    Notes: Eisenoxyde existieren in zwei verschiedenen Modifikationen, einer ferromagnetischen mit γ-Struktur und einer paramagnetischen mit α-Struktur. Zur Bildung von γ-Eisenrost kommt es in feuchter Luft, zu der von α-Eisenrost in Wasser mit starken Oxydationsmitteln oder in organischen Mitteln. Das magnetische Verhalten der Eisenoxyde läßt auf die Art der Rostbildung zurückschließen. Das Ergebnis der Magnetprüfung deckt sich mit dem von Röntgen-Feinstruktur-Untersuchungen.
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 634-641 
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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 Behaviour of Materials with Regards to FluorineIn the technical literature of the last five years, a large number of reports have been published about the behaviour of materials with regards to gaseous and liquid Fluorine. A summation and sifling of this scattered knowledge, leads to a general view of the present level of our knowledge about the handling of this aggressive material.Those metals which are not attacked by Fluorine, are nickel and its alloys with about 30% of copper, but also non-alloy steels, copper and aluminium are resistant to dry Fluorine. Carbon is the material used for electrodes in the electrolytical manufacture process of Fluorine. Oxydeceramic materials and some special acid resistant cements can be used to handle Fluorine. Glass and quartz are hardly attacked by the dry gas, even up to quite high temperatures. Organic materials are in general non-resistant.
    Notes: In der Fachliteratur der letzten fünf Jahre ist eine große Zahl von Mitteilungen über das Verhalten der Werkstoffe gegenüber gasförmigem und flüssigem Fluor veröffentlicht worden. Eine Zusammenfassung und Sichtung dieser zerstreut vorliegenden Erkenntnisse führt zu einem Überblick über den heutigen Stand unseres Wissens hinsichtlich der Handhabung dieses aggressiven Stoffes.Die gegen Fluor beständigsten Metalle sind Nickel und seine Legierungen mit etwa 30% Kupfer, aber auch unlegierter Stahl sowie Kupfer und Aluminium sind gegen trockenes Fluor resistant. Kohlenstoff wird als Elektrodenmaterial für die elektrolytische Fluor-Herstellung verwendet. Oxydkeramische Stoffe und einige säurebeständige Spezialkitte sind für die Handhabung von Fluor geeignet und auch Glas und Quarz werden von dem trockenen Gas bis zu recht hohen Temperaturen kaum angegriffen. Organische Werkstoffe sind im allgemeinen nicht beständig.
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 652-662 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Description / Table of Contents: On the Behavior of Materials upon Sulfuric AcidA survey of the behavior of metal and non metal materials upon sulfuric acid of various concentrations is given. This is followed by a discussion of the influence of different additives in the sulfuric acid upon the corrosion of metal materials. Organic and inorganic additives which derive from the production and the application of the sulfuric acid are treated. The behavior of sulfuric acid in its mixtures of reacting components are discussed also.
    Notes: Zunächst wird ein Überblick über das Verhalten von metallischen und nichtmetallischen Werkstoffen gegenüber Schwefelsäure verschiedener Konzentration gegeben. Dann wird auf den Einfluß eingegangen, den die verschiedenen Beimengungen in der Schwefelsäure auf die Korrosion metallischer Werkstoffe haben. Es werden nicht nur nur die anorganischen und organischen Beimengungen behandelt, die bei der Herstellung und Verwendung von Schwefelsäure entstehen, sondern auch das Verhalten von Schwefelsäure in Mischung mit Stoffen, die in Gegenwart von Schwefelsäure umgesetzt werden.
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 662-669 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 670-676 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 680-682 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 697-697 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 697-697 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 704-704 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 705-708 
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    Description / Table of Contents: The results of the corrosion tests of cathodically protected iron specimens in aired and not aired soils were published in article I. This paper is a report on further corrosion tests on cathodically protected iron specimens in soils which have been carried out to explain the influence of the soil water to soil air ratio. The corrosion of the protected specimens decreased when the soil had reached its water saturation limit as it should have been expected. On basis of these investigations you could get quantitative and reliable datas of the effectiveness of the cathodic protection on the corrosion of the cathodic protection on the corrosion of the protected metal in dependence of the soil water to soil air ratio which characterizes the aggressiveness of soils. The results of these investigations could be used also to put up general corrosion charts for materials to be protected by cathodic protection.
    Notes: Nachdem über die Ergebnisse der mit kathodisch geschützten Eisenproben in belüfteten und unbelüfteten Böden durchgeführten Korrosionsversuche bereits berichtet wurde (Mitteilung I), wird in der vorliegenden Arbeit über weitere Korrosionsversuche berichtet, die mit kathodisch geschütztem Eisen im Erdreich zur Klärung des Einflusses des W-Bd-Verhältnisses durchgeführt wurden. Wie zu erwarten war, wurde der Angriff der geschützten Probe verringert, wenn der Boden die Sättigungsgrenze an Wasser erreicht hatte. Auf Grund der durchgeführten Versuche können quantitative, zuverlässige Aussagen über die Wirkung des kathodischen Schutzes auf den Korrosionsablauf des geschützten Metalls in Abhängigkeit vom W-Bd-Verhältniswert, der für die Aggressivität des Bodens maßgebend ist, gemacht und zur Aufstellung allgemeiner Korrosionsschemen für einen kathodisch zu schützenden Werkstoff herangezogen werden.
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    Materials and Corrosion/Werkstoffe und Korrosion 6 (1955), S. 141-145 
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    Materials and Corrosion/Werkstoffe und Korrosion 6 (1955), S. 146-148 
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    Materials and Corrosion/Werkstoffe und Korrosion 6 (1955), S. 149-151 
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    Materials and Corrosion/Werkstoffe und Korrosion 6 (1955), S. 136-141 
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    Description / Table of Contents: The Mechanism of the Decomposition of Hydrogen-Peroxide on Metallic LeadThe potentials of the galvanic cells Pb/Pt and Pb/Ag in electrolytes containing 0,01-0,4 mols of H2O2 were plotted against time. The obtained results allow to draw conclusions on the mechanism of the catalytic decomposition of H2O2 on lead.The decomposition of H2O2 on metallic lead in 0,01-0,25 molar solutions of H2O2 at 20, 40 and 60°C temperature is characterized by a period of induction. The effect does not occur at higher concentrations of H2O2. If the specimen is preliminarily dipped into a 0,1 molar solution of H2O2 at 20°C temperature for 30 min. no period of induction occures. The decomposition under these conditions is a reaction of zero order.By the effect of H2O2 on freshly precipitated Pb(OH)2 a number of higher leadoxides are produced. Their general formula is PbOn where n is a number between 2 und 3.Experiments on the influence of the state of the surface on the corrosion of lead are discussed.
    Notes: Der Wasserstoffsuperoxyd-Zerfall auf metallischen Blei wurde elektrochemisch und kinetisch verfolgt, wobei die ständige Änderung der Bleioberfläche durch einige Kontaktsubstanzen, die der 0,01 bis 0,4 mol-H2O2-Lösung zugesetzt wurden, durch Potential-Zeit-Messungen, mittels einer Platin- und Silber-Hilfselektrode verfolgt wurde.Der Wasserstoffsuperoxyd-Zerfall auf metallischem Blei bei 20, 40 und 60°C in 0,01 bis 0,25 mol H2O2-Lösung ist durch eine Induktionsperiode gekennzeichnet, die jedoch bie höheren Konzentrationen vollständig verschwindet. Wird die Bleiprobe vor dem Eintauchen in die H2O2-Versuchslösung in einer 0,1 mol-H2O2-Lösung etwa 30 min bei 20°C behandelt, so verschwindet die Induktionsperiode. Die Zerfallreaktion läuft dann als Reaktion nullter Ordnung ab. Durch Einwirkung von H2O2 auf frisch vorbereitetes Pb(OH)2 entsteht eine Reihe höherer Bleioxyde der allgemeinen Formel PbOn, wo n Werte zwischen 2-3 darstellen kann.
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    Materials and Corrosion/Werkstoffe und Korrosion 6 (1955), S. 152-153 
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    Materials and Corrosion/Werkstoffe und Korrosion 6 (1955), S. 154-156 
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    Materials and Corrosion/Werkstoffe und Korrosion 6 (1955), S. 157-157 
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    Materials and Corrosion/Werkstoffe und Korrosion 6 (1955), S. 158-158 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 529-529 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. I 
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    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 1-6 
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    Description / Table of Contents: On the Corrosion of Wine Bottle aps Made of Thinly Tinned Lead (Tinfoil Caps) and their TestingSeveral method have been developed for the testing of the thickness and porosity of the tin layers of the customary tinfoil caps. The tin layers of commercial wine bottles were found to be less than 0,001 mm and for a great part considerably porous.To test the resistance of the caps to corrosion, laboratory experiments and practical storage tests have been carried out with commercially capped bottles. Under certain conditions which might be met in practice the caps were corroded considerably, and in some cases they were deteriorated totally. The corrosion products are lead salts.
    Notes: Es wurden Verfahren für die Prüfung der Dicke und der Porigkeit der Zinnauflage auf den üblichen sogenannten “Stanniol” - Flaschenkapseln entwickelt. Kapseln von aus dem Handel bezogenen Weinflaschen waren fast stets unter 0,001 mm dick verzinnt und meist erheblich porig.Zur Prüfung der Korrosionsbeständigkeit der Kapseln wurden Laboratoriumsversuche mit Kapseln und praktische Lagerversuche mit handelsüblich verkapselten Flaschen ausgeführt. Unter gewissen Bedingungen, die in der Praxis durchaus vorkommen können, wurden die Kapseln unter Bildung von Bleisalzen erheblich korrodiert, in einigen Fällen sogar völlig zerfressen.
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 530-530 
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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
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 544-544 
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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
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