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  • Articles  (1,660)
  • Other Sources  (46)
  • Polymer and Materials Science  (1,660)
  • AERODYNAMICS  (46)
  • 550 - Earth sciences
  • 1960-1964
  • 1955-1959  (1,706)
  • 1959  (1,072)
  • 1956  (634)
  • 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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    Weinheim [u.a.] : Wiley-Blackwell
    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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    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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  • 16
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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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  • 17
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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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  • 18
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    Weinheim [u.a.] : Wiley-Blackwell
    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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  • 19
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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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  • 20
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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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  • 21
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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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  • 22
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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 
    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. 177-181 
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    Keywords: Chemistry ; Polymer and Materials Science
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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 7 (1956), S. 189-198 
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    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 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 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. 335-337 
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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. 405-410 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 416-420 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 602-606 
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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. 626-628 
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    Keywords: Chemistry ; Polymer and Materials Science
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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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    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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    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 7 (1956), S. 516-524 
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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. 533-534 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 529-530 
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    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 544-544 
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 186-194 
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 152-158 
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    Description / Table of Contents: Fissile and Construction Metals in Atomic ReactorsWithout any undervaluation of previously achieved success, the beginning of the world wide commercializing of nuclear technics may be considered as to coincide with the first Geneva conference. Considering the first conference as a initial balance sheet of nuclear fission, the second conference would have been that of nuclear fusion. Using the same metaphor, all the following international meetings on those items will be interim balances demonstrating to which extent the ideas of 1955 and 1958 will have been realised and applied to the modern supply of energy without fossile fuels.Both the Geneva conferences showed the decisive importance of metallurgy for the future development of nuclear technics. It has to deal with the problem how to construct dependable and competitive devices within the range of our technical possibilities which comply with the requirements of theoretical physics.This and the following papers contain treatments on the materials under key words or headlines as follow: Summary of the materials used in atomic reactors, absorption of neutrons as a material constant, the geology of uranium and thorium, the chemistry and metallurgy of reactor materials and industrial isotope technics.
    Notes: Ohne die vorher erreichten Erfolge gering einschätzen zu wollen, fällt der eigentliche Beginn einer weltweiten Kommerzialisierung des Atoms mit der 1. Genfer Atomkonferenz zusammen. Wurde 1955 eine Art Eröffnungsbilanz' der Kernspaltung gegeben, hatte die 2. Konferenz des Jahres 1958 alle Merkmale einer Eröffnungsbilanz der Kernverschmelzung. Alle weiteren internationalen Veranstaltungen zum Thema Atom werden dann  -  um im Bilde zu bleiben  -  jeweils als Zwischenbilanzen demonstrieren, was von den 1955 und 1958 gesteckten Zielen im weltweiten Rahmen realisiert und in eine neue Energieversorgung ohne fossile Brennstoffe eingebaut werden konnte.Auf beiden Genfer Konferenzen trat die entscheidende Bedeutung der Metallurgie für die zukünftige nukleare Weiterentwicklung offen zutage. Ihr ist die Aufgabe gestellt, die von der theoretischen Physik oft weit vorausgesteckten Ziele auf dem Boden technischer Realitäten in betriebssichere und wettbewerbsfähige Konstruktionen umzuwandeln.In der vorliegenden und den folgenden Abhandlungen werden die werkstofflichen Perspektiven, soweit sie in Genf erkennbar waren, zur Darstellung kommen, und zwar unter folgenden Stichworten, die gleichzeitig Abschnittsüberschritte sind: Werkstoffbilanz der Atomreaktoren, Neutronenabsorption als Materialkonstante, Geologie des Urans und Thoriums, Chemie und Metallurgie der Reaktorwerkstoffe, industrielle Isotopentechnik.
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 195-195 
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 255-259 
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    Description / Table of Contents: With the aid of a voltage diagram, definite ranges of potential differences can be determined each of them characterising special corrosion conditions for this metal. Above the minimum corrosion potential, titanium can be rendered chemically inactive by coating with a layer of titanium-hydride (hydride-passive condition). This condition is reached normally in the presence of strong cathodic polarisation only. Exceeding a critical potential difference, the metal becomes chemically active. Corrosion and hydrogen generation take place (normal corrosion in non-oxidising acids). Exceeding the critical P.D for passivity the metal is covered with an oxide layer which again renders it inactive, (oxide-passive condition). This is the condition responsible for the excellent corrosion-resisting properties of titanium in oxidising media. With relatively high potential differences which occur only by anodic polarisation and not in oxidising media, activation is again encountered in halogenide solutions(trans-passive condition). Titanium is attacked in the forms of scars. In solutions free from halides there is no corrosion at strong anodic polarisations. The different corrosion conditions on titanium in various ranges of P.D. are explained by characteristic examples.
    Notes: Es lassen sich für Titan verschiedene Potentialbereiche an Hand eines Strom-Spannungsdiagramms festlegen, innerhalb derer ein für das Metall jeweils charakteristisches Korrosionsverhalten besteht. Oberhalb des Immunitätspotentials wird Titan durch Bedeckung mit einer Titanhydridschicht passiv (hydrid passiver Zustand). Der hydridpassive Zustand wird normalerweise nur bei starker kathodischer Polarisation erreicht. Bei Überschreiten eines kritischen Potentials wird das Metall aktiv. Es tritt Korrosion unter Wasserstoffentwicklung ein (normale Korrosion in nichtoxydierenden Säuren). Bei Überschreiten des kritischen Passivierungspotentials wird das Metall von einer Oxydschicht bedeckt und dadurch erneut passiv (oxydpassiver Zustand). Der oxydpassive Zustand ist für die ausgezeichnete Korrosionsbeständigkeit des Titans gegenüber oxydierenden Medien verantwortlich. Bei relativ hohen Potentialen, die nur durch anodische Polarisation, nicht hingegen durch Oxydationsmittel erreicht werden, tritt in halogenidhaltigen Lösungen erneut Aktivierung ein (transpassiver Zustand). Titan wird narbenförmig angegriffen. In halogenidfreien Lösungen dagegen tritt bei starker anodischer Polarisation keine Korrosion ein. An Hand einer Reihe von charakteristischen Beispielen wird das unterschiedliche Korrosionsverhalten des Titans in den verschiedenen Potentialbereichen erklärt.
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 274-274 
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 275-276 
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. VII 
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 281-304 
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    Description / Table of Contents: Fluates as binding media in the production of chemically resistant and capillary-tight cement and concrete1According to a new theoretical conception of the author, a clearer picture of the processes of hydration and hydraulic hardening in mortar was obtained as a result of obtaining an attack-resisting binder of the cement lime by means of a planned chemical transformation with fluates, and also through the clarification of their reaction mechanism; and this indicates new ways of determining the factors which influence chemical attack on concrete. By these means it was proved that the conventional view of these processes is not correct and must be critically re-examined.2Fluates contained in the mixing water cause a change in the mortar-like properties of the cement and improve working quality, strength capillary density and resistance to attack. Fluates are thus suitable ingredients for the production of resistant, dense cement-mortar and concrete; they influence its useful life and applications range.3Results of laboratory experiments are confirmed by manifold practical experience over long periods of observation. In view of this agreement of results the new knowledge is of fundamental practical and theoretical importance in the solution of the problem of attack on cement.
    Notes: 1Nach einer neuen zementtheoretischen Anschauung des Verfassers wurde durch die aggressionsbeständige Bindung des Kalkhydrats des Zements mittels einer gezielten chemischen Umsetzung durch Fluate und die Aufklärung ihres Reaktionsmechanismus eine vertiefte Vorstellung über die Vorgänge der Hydratation und der hydraulischen Erhärtung im Mörtelbett gewonnen und damit neue Wege zur Feststellung der die Betonaggression bestimmenden Einflußfaktoren aufgezeigt. Es konnte dadurch nachgewiesen werden, daß die bisherigen Anschauungen Über diese Vorgänge nicht zutreffen und einer kritischen Überprüfung unterzogen werden müssen.2Fluate im Anmachewasser bewirken eine Veränderung der mörteltechnischen Eigenschaften des Zements und verbessern dadurch Verarbeitbarkeit, Festigkeit, Kapillardichte und Aggressionsbeständigkeit. Demnach sind Fluate Zementwirkstoffe zur Herstellung von aggressivbeständigem, kapillardichtem Zementmörtel und Beton, wodurch deren Gebrauchsdauer und Anwendbarkeit entscheidend beeinflußt wird.2Laboratoriumsmäßige Untersuchungsergebnisse werden durch vielseitige praktische Erfahrungen nach langen Beobachtungszeiten bestätigt. Im Hinblick auf diese Übereinstimmung sind die neuen Erkenntnisse für die Lösung des Problems der Betonaggression theoretisch und praktisch von grundlegender Bedeutung.
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 332-335 
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 335-336 
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 458-460 
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 464-467 
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 475-475 
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. XVI 
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    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 477-489 
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    Description / Table of Contents: Protective Coats of Sprayed SchandauNumerous examples show that especially zinc and aluminium covers as well as composite double covers have proved good in anti-rust protection. By additional, especially selected coats of paint their protective effect could be increased. The values of applied and lost quantities of sprays depend functionally on the largeness of the surface to be metallized. There is a description of a stratum-meter. The scattering of the thickness of sprayed layers on large surfaces as well as some spraying - procedure effects are discussed. To achieve sprayed covers of uniform thickness the spraying gun led by hand must be replaced by a mechanism. These things are demonstrated by some practical examples. Further development is supposed to follow some specific suggestions of the author.
    Notes: Für den Schutz gegen Verrostung haben sich besonders Zink- und Aluminium-, aber auch Halbundhalb-Doppelschichten aus beiden Metallen bewährt, wie an zahlreichen Beispielen gezeigt wird. Deren Rostschutzwirkung kann beträchtlich verstärkt werden durch zusätzliche Deckanstriche, die für den Zweck ausgesucht sein müssen. Bestimmungen des Spritzgutverbrauchs und -verlustes zeigten die funktionelle Abhängigkeit von der Größe der zu metallisierenden Flächen, wonach die Spritzgutverluste im Prinzip um so größer und die Ausbeuten um so kleinere Flächen und Teilverbände auflösen.Für Schichtdicke-Messungen in Betracht kommendes Gerät wurde beschrieben. Die Streuung der Schichtdicke innerhalb von Großflächen wurde nebst beeinflussenden Varianten des Spritzvorganges erörtert. Um mit Sicherheit gleichmäßige Schichtdicken spritzen zu können, muß die z. Z. noch überwiegende Führung der Spritzpistolen per Hand durch Mechanisierung abgelöst werden. Hierfür wurden Beispiele aus der Spritzpraxis genannt und die zukünftige notwendige Weiterentwicklung durch entsprechende Anregungen angedeutet.
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