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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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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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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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    Source: Wiley InterScience Backfile Collection 1832-2000
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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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