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  • Polymer and Materials Science  (28,413)
  • EARTH RESOURCES AND REMOTE SENSING  (6,923)
  • 2010-2014
  • 1980-1984  (18,392)
  • 1975-1979  (16,944)
  • 1925-1929
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 230-233 
    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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  • 2
    Electronic Resource
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 245-247 
    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 26 (1975), S. 235-240 
    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 26 (1975), S. 240-245 
    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 26 (1975), S. 270-277 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Corrosion behaviour of hot dip galvanized steel in cold and warm model waters with gassing by CO2 and/or O2 and as a function of lime hardnessIn oxygen-or carbon dioxide free waters the corrosion is due to the evolution of hydrogen from water; this corrosion is accelerated by higher chloride contents. It is therefore advisable to keep chloride contents below 150 mg/l Cl-. In the presence of oxygen the zinc coating is attacked by oxygen; here, too, the influence of chlorides is quite evident. The presence of a certain water hardness gives rise to the formation of protective layers. When the water contains carbon dioxide the corrosion is of the acid type; it is inhibited, however, by protective layer formation. It should be borne in mind, that the hardness of water has a favourable effect only in cold waters, while it is very deleterious in warm waters. Water flow gives rise to accelerated corrosion. Pitting can be prevented by oxygen elimination or by the formation of protective layers. This layer formation is optimum under lime-carbonic acid equilibrium conditions.
    Notes: In sauerstoff- und kohlendioxidfreien Wässern ist die Korrosion bedingt durch Wasserstoffentwicklung aus Wasser; dieser Angriff wird durch höhere Chloridgehalte beschleunigt. Es ist daher zweckmäßig, die Chloridgehalte unter 150 mg/l Cl- zu halten. In Gegenwart von Sauerstoff wird das Zink durch Sauerstoffkorrosion angegriffen, wobei ebenfalls der Chloridgehalt deutlich erkennbar ist. Bei einer bestimmten Wasserhärte bilden sich schützende Schichten. Enthält das Wasser Kohlendioxid, so handelt es sich um eine Säurekorrosion, die jedoch durch Schutzschichtbildung gehemmt werden kann. Zu berücksichtigen ist, daß sich die Wasserhärte nur in kalten Wässern günstig auswirkt, in warmen Wässern hingegen ungünstige Wirkung besitzt. Durch Strömung wird die Korrosion beschleunigt. Lochfraß kann durch Freihalten von Sauerstoff oder durch Schutzschichtbildung verhindert werden. Diese Schutzschichtbildung erfolgt optimal beim Kalk-Kohlensäuregleichgewicht.
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  • 6
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 278-287 
    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: Studies concerning the corrosion behaviour of cast and wrought implant materialsImplants can fulfill their substitution duty in the body for decades only if the materials used are resistant to pitting corrosion, crevice corrosion, stress corrosion cracking and corrosion fatigue in chloride-containing body fluids.This applies especially to the new generation of compound endoprotheses. Though these combine the advantages of cast moving parts with those of forged anchorage shafts, there is a possibility of galvanic element formation.The susceptibility of various implant alloys to these different types of corrosion is determined, with special emphasis on the compound design of joint endoprotheses.
    Notes: Implantate können ihre Ersatzfunktion im Körper nur dann über Jahrzehnte erfüllen, wenn zu ihrer Fertigung Werkstoffe verwendet werden, die im chloridhaltigen Körpermilieu gegen Lochfraß, Spalt-, Spannungsriß- und Ermüdungskorrosion beständig sind.Dies gilt insbesondere auch für die neue Generation von Verbundendoprothesen, in denen die Vorzüge gegossener Bewegungsteile mit denjenigen geschmiedeter Verankerungsschäfte vereinigt sind, wobei jedoch die Möglichkeit galvanischer Elementbildung besteht.In der vorliegenden Arbeit wird die Anfälligkeit verschiedener Implantatlegierungen gegen die erwähnten Korrosionsformen untersucht, wobei Verbundkonstruktionen bei Gelenkendoprothesen besondere Berücksichtigung finden.
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  • 7
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 32-36 
    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
    Description / Table of Contents: Composite tubes with high corrosion resistance at high temperaturesThis paper describes studies on the compatibility of alloys used in composite tubes exposed to 600-800 °C. The alloys were chosen on the basis that one (ironrich, clad alloy) has good high temperature strength and the other (nickel-chromium cladding) has good high temperature corrosion resistance. The interdiffusion of elements from one alloy to the other has been studied using the microprobe analyser.The interdiffusion of major alloy elements (e.g. iron) is affected both by the chromium content of the cladding and the zirconium content (added to improve hot workability). The diffusion of carbon from the clad alloy into the cladding is controlled by the identity of the carbide forming elements in the clad material. The mechanism of these compositional effects is discussed.
    Notes: Dieser Bericht beschreibt die Verträglichkeit von Legierungspaarungen bei Verbundrohren, die Temperaturen von 600-800 °C ausgesetzt sind. Die Werkstoffe wurden so ausgewählt, daß die eine Legierung (eisenhaltige, plattierte Legierung) eine gute Warmfestigkeit hat, während die andere (nickel-chrom-plattierte) Legierung eine gute Korrosionsbeständigkeit bei hohen Temperaturen aufweist. Die Diffusion der Elemente durch die Grenzfläche von einer Legierung zur anderen wurde durch Analyse mittels Elektronenstrahlsonde untersucht.Die Grenzflächendiffusion der Haupt-Legierungselemente (z. B. Eisen) wird beeinflußt durch den Chromgehalt der Plattierung und durch den Zirkongehalt (wird zugesetzt, um eine Heißbearbeitung zu verbessern). Die Kohlenstoffdiffusion des Grundwerkstoffes in die Plattierung wird durch die Gleichheit der karbidbildenden Elemente in den beiden Werkstoffen gesteuert. Der Mechanismus der Legierungseinflüsse wird diskutiert.
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  • 8
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 45-47 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Corrosion by weld slag of refractory chromium nickel steels in radiative heating tubesThe elevated sulfur concentration in the weld slags on refractory steels with nickel contents between 10 and 48% has given rise to considerable corrosion and the steels were destroyed by the low melting NiS eutectic. This corrosion is more severe in atmospheres resulting from incomplete combustion than in oxidizing atmospheres. Corrosions have been encountered in nonwelded material, too; in this case the formation of NiS can be attributed to the presence of CaO in the blast furnace gas; the incrustations then formed behaved like the welding slag and absorbed sulfur from the gas. It is recommended in such cases to weld not with wire electrodes but to use the TIG method.
    Notes: Die hohe Schwefelkonzentration in der Schweißschlacke führte zu starker Korrosion hitzebeständiger Stähle mit Nickelgehalten zwischen 10 und 48%; die Stähle wurden durch das NiS-Eutektikum (niedriger Schmelzpunkt) zerstört. Der Angriff ist in unvollständig verbrannten Atmosphären stärker als in oxidierenden. Auch im nichtgeschweißten Material trat Korrosion auf; in diesem Fall war die Bildung des NiS bedingt durch die Anwesenheit von CaO in dem zur Heizung verwendeten Gichtgas; die Staubablagerungen verhielten sich dann wie Schweißschlacke und nahmen Schwefel aus dem Gas auf. Es empfiehlt sich daher, in solchen Fällen nicht mit Elektrode und Zusatzdraht zu schweißen, sondern nach dem WIG-Verfahren zu arbeiten.
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  • 9
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 48-53 
    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 26 (1975), S. 72-73 
    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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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 80-83 
    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 26 (1975), S. 74-80 
    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
    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 26 (1975), S. 90-90 
    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 26 (1975), S. 90-90 
    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
    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 26 (1975), S. 166-167 
    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 26 (1975), S. 167-168 
    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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  • 19
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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  • 20
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 172-173 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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  • 21
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 83-83 
    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 26 (1975), S. 84-86 
    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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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 86-87 
    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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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 90-90 
    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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  • 25
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 36-41 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Corrosion resistance of stainless steels at the atmosphere - Evaluation of the results of weathering tests up to 10 years' duration -The evaluation of results obtained in the course of weathering tests up to 10 years' duration has confirmed the conclusions drawn after one year's exposition. A CrNiMo steel (Werkstoff-Nr. 1.4401) can be used even in the most severe conditions; slight corrosions found in marine atmospheres can be attributed to unpolished surfaces. The 17% Cr steel is considerably attacked in industrial and marine atmospheres and should not be used for the external parts of buildings. 18/8 steels are perfectly resistant to urban atmosphere, with the exception of those portions which are not exposed to the cleaning effect of rain waters. In all the cases studied the corrosion resistance of the steels has been improved by electropolishing. Electrochemical studies have further revealed that the pitting corrosion susceptibility decreases in the same order as the atmospheric corrosion resistance.
    Notes: Die Auswertung der Ergebnisse, die bei Bewitterungsversuchen bis zu 10 Jahren Dauer erhalten wurde, hat die Schlußfolgerungen bestätigt, die nach einjähriger Auslagerung gezogen wurden. Danach kann ein CrNiMo-Stahl (Werkstoff-Nr. 1.4401) auch unter den schärfsten Bedingungen verwendet werden; geringfügige Korrosionserscheinungen in Meeresatmosphäre können der Tatsache zugeschrieben werden, daß die Oberfläche nicht poliert war. Der Stahl mit 17% Cr wird in Industrie- und Meeresatmosphäre stark angegriffen und ist deshalb zur Außenanwendung an Gebäuden unter diesen Bedingungen nicht geeignet. Der Stahl 18/8 ist in Stadtatmosphäre vollkommen beständig; eine Ausnahme bilden die Teile, die nicht dem Wascheffekt des Regenwassers ausgesetzt sind. In allen Fällen wird die Korrosionsbeständigkeit der Stähle durch elektrolytisches Polieren verbessert. Elektrochemische Untersuchungen haben ergeben, daß die Lochfraßempfindlichkeit in der gleichen Reihenfolge wie die Korrosionsanfälligkeit an der Atmosphäre abnimmt.
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  • 26
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 331-331 
    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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  • 27
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 331-331 
    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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  • 29
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975) 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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  • 30
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
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  • 31
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. XXIII 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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  • 32
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 333-337 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Corrosion in warm water heating systemsCorrosion in warm water heating systems is due to the presence of oxygen. In open systems oxygen can penetrate into the warm water by expansion vessels, at high through-puts because of unfavorable fitting connections of pumps and as a consequence of malfunctioning. Corrosion in closed systems occurs only in cases of temporary penetration of oxygen followed by air cushion formation. In view of the fact that the formation of protective surface layers from water constituents is able to reduce oxygen corrosion it is recommended to apply water softening only in such cases where the inhibition of incrustation becomes a necessity.
    Notes: Korrosionsschäden in Warmwasserheizungen sind nur bei Eintritt von Sauerstoff möglich. In offenen Heizungen kann der für eine Korrosion notwendige Sauerstoff über Ausdehnungsgefäße infolge zu hohen Wasserdurchsatzes, bedingt durch ungünstige Schaltungen, über Pumpenanschlüsse oder durch falsche Betriebsweisen in das Heizungswasser gelangen. Auch in geschlossenen Anlagen tritt nur dann ein Korrosionsschaden oder die sekundär bedingte, störende Gaspolsterbildung auf, wenn zeitweilig Luftsauerstoff in das System gelangen kann. Die Art des Heizungswassers kann über eine Deckschichtbildung bei Sauerstoffzutritt die Korrosionsneigung verringern, so daß eine Enthärtung nur dann gewählt werden sollte, wenn sie zur Vermeidung von kritischer Wassersteinbildung erforderlich ist.
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  • 33
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 338-342 
    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: Determination of corrosion rates in liquid media using radionuclidesThe method described is simple and yields results in a short time even at rather low corrosion rates. The lowest rates measured here were of the order of 1 to 10 mg/m2. day. This sensitivity can even be increased by suitable measuring setups. In the case of steels it is possible without difficulty to separately measure up to three constituents, so that it is possible to study corrosion phenomena in the passivity and transition regions. On principle γ and β-radiation can be used but the former is preferable in particular for the analysis of several constitutents. The half life of the radionuclides should be of the order of several hours and the γ-energies must not be below 100 keV. The experiments have been carried out with the following systems: CrNiMo-steels in sulfuric and hydrochloric acids and FeCl3 solutions.
    Notes: Die beschriebene Methode ist einfach und liefert auch bei niedrigen Korrosionsgeschwindigkeiten schon nach kurzer Zeit Ergebnisse. Die geringsten gemessenen Korrosionsgeschwindigkeiten lagen im Bereich zwischen 1 und 10 mg/m2. Tag. Diese Empfindlichkeit kann mit Hilfe von geeigneten Meßanordnungen noch weiter erhöht werden. Im Falle der Stähle kann man ohne Schwierigkeit bis zu drei Bestandteile getrennt messen, so daß auch die Untersuchung von Korrosionsvorgängen im Passiv- und im Übergangsbereich möglich ist. Grundsätzlich sind die γ- und die β-Strahlung geeignet, die erste ist jedoch vorzuziehen, besonders zur Analyse mehrerer Bestandteile. Die Halbwertszeit der Radionuklide muß in der Größenordnung von mehreren Stunden liegen und die γ-Energie darf nicht weniger als 100 keV betragen. Die Versuche wurden speziell mit den folgenden Systemen durchgeführt: CrNiMo-Stähle in Schwefel- und Salzsäure sowie in FeCl3-Lösung.
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 342-349 
    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: Phenomena involved in the formation of protective layers in galvanized steel tubingOn the basis of studies in connection with the influence of time and flow rate on the corrosion of zinc it is possible to say that the corrosion rate is not time dependent, while it is a function of water pH and of flow conditions. It is approximately inversely proportional to the thickness of the diffusion boundary layer. The values obtained by electrochemical tests point to a strong inhibition of the partial cathodic reactions; this inhibition increases continuously with time because of this inhibition the Stern-Geary formula is not applicable; consequently it is not possible to electrochemically determine the corrosion loss in a short time. It is equally impossible to interprete i(U) curves and polarization resistance on the basis of experimental results so far available.
    Notes: Die vorliegenden Untersuchungen über den Einfluß der Zeit und der Fließgeschwindigkeit auf den Zinkabtrag gestatten folgende Aussagen:Die Zinkabtragsrate ist zeitlich konstant und abhängig vom pH-Wert des Wassers und von der Fließbedingung. Die ist näherungsweise umgekehrt proportional der Diffusionsgrenzschichtdicke.Elektrochemische Meßgrößen zeigen, daß anodische und kathodische Teilvorgänge stark gehemmt sind und daß zeitlich die Hemmwirkung stetig zunimmt. Das führt dazu, daß die Stern-Geary-Beziehung nicht anwendbar ist und somit eine schnelle Bestimmung der Abtragsrate elektrochemisch nicht erfolgen kann. Die Interpretation von i(U)-Kurven und Polarisationswiderständen ist z. Z. mit den vorliegenden Untersuchungsergebnissen nicht möglich.
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 355-355 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 359-361 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 356-356 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Description / Table of Contents: Study of a dental alloy based on gold platinum alloyThe alloy which contains a certain quantity of silicon is composed of mixed crystals with inclusions of intermetallic compounds. During thermal treatment (for degassing) a surface layer of SiO2 is formed. This layer acts on the one hand as an adhesive for the dental porcelaine and on the other hand in contact with saliva is transformed into a colloidal condition which is required for appropriate physiological condition.
    Notes: Die Legierung, die auch eine gewisse Menge Silicium enthält, besteht aus Mischkristallen mit Einschlüssen intermetallischer Verbindungen. Bei der Wärmebehandlung (zur Entladung) entsteht an der Oberfläche eine SiO2-Schicht, die einerseits als Haftmittel für das Dentalporzellan dient und andererseits bei Kontakt mit Speichel in einen kolloidalen Zustand übergeht, so daß ein physiologisch einwandfreies Verhalten erreicht wird.
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 134-137 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 151-154 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 154-155 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 165-166 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 168-169 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 553-560 
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    Materials and Corrosion/Werkstoffe und Korrosion 27 (1976), S. 5-9 
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    Description / Table of Contents: Investigation into the influence of sulfide and sulfate ions on the corrosion of iron in alcaline solutionThe corrosion behaviour of Armco iron as well as that of a technical high-strength steel was investigated in sulphide - and sulphate-containing electrolytes of pH ∼ 12.6.Current density - potential curves show that iron, after successful passivation, remains passive and protected against corrosion in a solution saturated with CaS, CaSO4 and Ca(OH)2 at potentials up to 800 mV(EH).Passivation experiments conducted by changing from the active region to various anodic potentials yielded a critical potential region around 300 mV(EH), above which corrosion appeared. Up to EH = 200 mV complete passivation was observed.The same critical potential region was observed in experiments of repassivation after mechanical damaging of a protective passive layer.Additional tensile stresses of 85%· σ0,2 caused no stress corrosion cracking at a potential of 500 mV(EH). After damaging the passive layer, through scratching of the stressed wires fracture occured at and above potentials of 300 mV(EH). At 200 mV(EH) repassivation was observed even under tensile load. In a sulphate-free Na2S/Ca(OH)2 solution of the same sulphide ion concentration no stress corrosion cracking of the samples occured at any potential up to 800 mV(EH) even after scratching the steel samples. The observed stress corrosion in sulphide - and sulphate-containing electrolytes is to be ascribed to the action of sulphate and not to sulphide ions.
    Notes: Das Korrosionsverhalten von Armco- Eisen sowie eines hochfesten Baustahls wurde in sulfid- und sulfathaltigen Elektrolyten beim pH ∼ 12,6 untersucht. Stromdichte/Potential-Kurven zeigen, daß Eisen nach Passivierung passiv bleibt und damit in mit CaS, CaSO4 und Ca(OH)2 gesättigten Lösungen bis 800 mVEH gegen Korrosion geschützt ist. Bei Passivierungsversuchen unter Übergang vom Aktivbereich zu verschiedenen anodischen Potentialen ergab sich ein kritischer Potentialbereich um 300 mVEH, oberhalb dessen Korrosion auftritt. Der gleiche kritische Potentialbereich wurde bei Repassivierungsversuchen nach mechanischer Beschädigung einer schützenden Passivschicht gefunden. Zusätzliche Zugspannungen in Höhe von 85% der Streckgrenze führten bei 500 mVEH nicht zu Spannungsrißkorrosion. Nach Beschädigung der Passivschichten durch Kratzen der gespannten Drähte trat jedoch bei und oberhalb 300 mVEH Bruch auf; bei 200 mVEH kam es auch unter Belastung zu Repassivierung. In sulfatfreier Lösung von Na2S und Ca(OH)2 gleicher Sulfidionenkonzentration kam es bis 800 mVEH zu keiner Spannungsrißkorrosion, auch nicht nach Beschädigung der Passivschicht. Die beobachtete Spannungskorrosion in sulfid- und sulfathaltigen Elektrolyten ist daher der Wirkung von Sulfat- und nicht der von Sulfidionen zuzuschreiben.
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 173-173 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 406-408 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 408-415 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 404-406 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 655-657 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 672-673 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 674-674 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 431-431 
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    Materials and Corrosion/Werkstoffe und Korrosion 27 (1976) 
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    Materials and Corrosion/Werkstoffe und Korrosion 27 (1976), S. 77-80 
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    Description / Table of Contents: Bestimmung des Lochfraßpotentials mit Hilfe galvanostatischer PolarisationstechnikenAusgehend von der Definition der in einem System möglichen Lochfraßpotentiale wird gezeigt, daß unter galvanostatischen Versuchsbedingugen Potentialoszillationen immer dann zu erwarten sind, wenn sich das Lochkeimbildungspotential Unp des Systems vom kritischen Potential der Lochrepassivierung Ucp unterscheidet.Im System Nickel in neutraler, chloridhaltiger Sulfatlösung sind die beobachteten Potentialschwankungen periodisch. Der untere Grenzwert entspricht dem kritischen Potential Ucp.
    Notes: Various characteristic pitting potentials are defined which may be observed in a system simultaneously. Following these definitions, galvanostatic polarization techniques are expected to result in potential oszillations whenever the pit nucleation potential, Unp, differs from the critical potential for pit repassivation, Ucp, of a system.With nickel polarized in neutral, chloride containing sulphate solution the electrode potential oscillates periodically. The lower limit responds to the critical potential, Ucp, determined by potentiostatic measurements.
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    Materials and Corrosion/Werkstoffe und Korrosion 27 (1976), S. 69-77 
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    Description / Table of Contents: Contribution to the Effect of Segregation on the Corrosion Resistance of Austenitic Cr-Ni-Mo-SteelsInvestigations of segregated austenitic Cr-Ni-Mo-steels by means of the Huey-test showed that even a short annealing at 800°C can reduce the corrosion resistance. Especially for steels having a pronounced segregation this reduction of corrosion resistance can be such that it hinders the practical application of the material. This sensitivity to corrosion can be explained by the formation of intermetallic phases from ferrite which appears in small quantities within the segregated areas. It can be reduced by slightly altering the chemical composition towards a better austenite-stability and by remelting the steels to lower their segregated.
    Notes: Die Untersuchung von austenitischen Cr-Ni-Mo-Stählen mittels Huey-Test ergab, daß bei Vorhandensein von Seigerungen bereits durch kurzzeitige Glühungen bei 800°C die Korrosionsbeständigkeit in einem für die Anwendung dieser Stähle nicht mehr zulässigen Ausmaß beeinträchtigt werden kann. Die Ursache für diese Korrosionsanfälligkeit liegt offenbar in der Entstehung von intermetallischen Phasen aus dem in Seigerungsbereichen in kleinen Mengen auftretenden Ferrit. Eine Verminderung der Seigerungskorrosion ist durch geringfügige Veränderung der Durchschnittszusammensetzung in Richtung höherer Austenitstabilität sowie durch Anwendung von Umschmelzverfahren zur Erniedrigung des Seigerungsausmaßes möglich.
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    Materials and Corrosion/Werkstoffe und Korrosion 27 (1976), S. 81-85 
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    Description / Table of Contents: Discussion of possible causes of intercrystalline stress corrosion cracking of warm underground pipelinesCathodically protected burried pipe lines can fail by intergranular stress corrosion cracking when suffiently high temperatures and tensile stresses are present. There are two types of failure mechanism. NaOH-type occurs with potentials 〈 -1 v ref. Cu/CuSO4 scale and 〉 120°F. Carbonate-type occurs with potentials 〉 - 0,75 v if pressure fluctuations are present. On basis of critical potential ranges protective measures as well as the suppositions regarding surface preparation and coating materials are discussed.
    Notes: Kathodisch geschützte erdverlegte Rohrleitungen können durch interkristalline Spannungsrißkorrosion gefährdet sein, wenn erhöhte Temperaturen und Zugspannungen vorliegen. Es gibt zwei verschiedene Schadensmechanismen. Der NaOH-Typ tritt bei UCu/CuSO4 〈 - 1 V und 〉 50°C auf. Der Carbonat-Typ tritt bei UCu/CuSO4 〉 -0.75 V auf, wenn geringfügige Druckschwankungen vorliegen. Aufgrund der verschiedenen kritischen Potentialbereiche werden Schutzmaßnahmen und die werkstoffseitigen Voraussetzungen bei der Rohrumhüllung erörtert.
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    Materials and Corrosion/Werkstoffe und Korrosion 27 (1976), S. 91-96 
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    Materials and Corrosion/Werkstoffe und Korrosion 27 (1976), S. 85-90 
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    Description / Table of Contents: Kritische Lochfraßpotentiale von Wolfram in Lithiumchlorid-Methanol-WasserlösungenDie kritischen Lochfraßpotentiale von Wolfram wurden bestimmt in 0,5 m LiCl/Xm H2O/Methanol, wobei X zwischen 0 und 55 lag. Die Potentiale wurden erhalten aus potentiostatischen Strom-Zeitkurven, die nach zwei verschiedenen Methoden ermittelt wurden: 1. das Potential der in der Lösung befindlichen Elektrode wurde mit einer bestimmten Potentialvorschubgeschwindigkeit auf den gewünschten Wert gebracht und 2. trockene Elektroden wurden unter einem angelegten Potential in die Lösung eingesetzt. Bei Wasserkonzentrationen bis 11 m betragen die nach 1 und 2 ermittelten kritischen Lochfraßpotentiale weniger als 2 V (gegen Ag/AgCl/0.5 m LiCl). Die nach der Methode 1 erhaltenen Potentiale sind 52 V, 62 V (Maximum) und 33 V für Lösungen mit 14, 28 und 55 mol H2O. Die nach der Methode 2 erhaltenen Potentiale sind etwa halb so groß wie die nach Methode 1; Ausnahmen sind die Werte für 14 und 17 mol Wasser, die etwa 4/5 dieser Werte erreichen. Die Form der Kurven des kritischen Lochfraßpotentials in Abhängigkeit von der Wasserkonzentration ähnelt der Form der Viskosität/Konzentration-Kurve von 1 m LiCl/H2O/Methanol-Lösungen, die in der Literatur angegeben sind. Für den Angriff durch Chloridionen wird ein Mechanismus vorgeschlagen, bei dem WO2Cl2 entsteht.
    Notes: The critical pitting potentials of tungsten were determined in 0.5 M LiCl - X M H2O - methanol solutions where X ranged from 0 to 55. They were obtained from potentiostatic current time curves measured by two different methods: (1) The potential of the electrode in solution was brought to the desired value at a definite rate of potential change (2) Dry electrodes were immersed into the solution under applied potential. At water concentrations up to 11. M the cpp's obtained by (1) and (2) are less than 2 V vs Ag/AgCl/0.5 M LiCl(aq). The cpp's obtained by method (1) are 52 V, 62 V (maximum value) and 33 V for solutions having 14. M, 28. M and 55. M H2O, respectively. The cpp's obtained by method (2) are about as half as large as those of (1) with the exception of the values for 14. M and 17. M H2O, which are about 4/5 as large. The shape of the cpp-water concentration curve is similar to that of the viscosity-concentration curve of 1 M LiCl-H2O-methanol solutions given in the literature. A mechanism for chloride ion attack of the film involving the formation of WO2Cl2 is proposed.
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 778-781 
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    Materials and Corrosion/Werkstoffe und Korrosion 27 (1976), S. 99-102 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 467-469 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 487-489 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 776-777 
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    Description / Table of Contents: Oxidation of austenitic steel welds at elevated temperaturesTwo steels (18-21 Cr, 8-11 Ni and 17-20 Cr, 7-10 Ni) welded with filler material of the composition 18 Cr, 11 Ni, have been studied with respect to their resistance to oxidizing atmospheres in the temperature range between 850 and 1000°C, test durations being up to 5000 h. The behaviour has been evaluated in terms of scale properties (compactness, adhesion), structural stability (by metallographic methods), scale composition (with the micro analizer) and investigation of diffusion from the base metal. On the basis of the results obtained it may be concluded that the base metal could be exposed to a maximum temperature of 900°C, while the welded zone is not sufficiently resistant at that temperature; consequently, the service temperature should be limited to a maximum of 850°C.
    Notes: Zwei Stähle (18-21 Cr, 8-11 Ni und 17-20 Cr, 7-10 Ni), geschweißt mit Elektroden der Zusammensetzung 18 Cr, 11 Ni, wurden auf ihre Beständigkeit in oxidierender Atmosphäre im Temperaturbereich zwischen 850 und 1000°C bei Versuchsdauern bis 5000 h untersucht. Die Auswertung erfolgt aufgrund der Zundereigenschaften (Kompaktheit, Haftfestigkeit), Gefügestabilität (metallographische Untersuchung), Zunderzusammensetzung (mittels Mikroanalysator) und Untersuchung der Diffusion von Grundwerkstoff aus. Aufgrund der Ergebnisse ist zu schließen, daß das Grundmetall für eine max, Temperatur von 900°C geeignet ist, während die geschweißte Zone bei dieser Temperatur nicht ausreichend beständig ist; infolgedessen muß die Einsatztemperatur auf maximal 850°C beschränkt werden.
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 798-800 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 801-808 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 808-814 
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    Materials and Corrosion/Werkstoffe und Korrosion 27 (1976), S. 313-314 
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    Description / Table of Contents: Crystallization of silver sulfide layers, excited by electron radiation in the scanning electron microscopeThe investigation of Ag2S layers deformed by the motion of a hard gold revet under the scanning electron microscope has shown that the crystals at the surface grow at a considerable velocity. Within 5 minutes after the beginning of the irradiation the diametre had increased from about 0.2 μm to about 1 μm.
    Notes: Bei REM-Untersuchungen von Ag2S-Anlaufschichten, die durch die Reibbewegung eines Hartgoldnietes verformt worden waren, wurde im REM eine bemerkenswert schnelle Entstehung von Kriställchen an der Oberfläche beobachtet. Diese wuchsen, beginnend mit einem Durchmesser von ca. 0,2 μm, innerhalb von 5 min Bestrahlung bis zu ca. 1 μm an.
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 215-229 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 250-251 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 233-235 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 247-248 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 248-250 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. XVII 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975) 
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    Description / Table of Contents: Results of studies into surface layers in copper tubingSurface layers of various compositions are formed in copper tubing for potable and industrial waters under service conditions and depending on water conditions. A first classification may be made in macroscopic terms; the composition of the layers is determined by chemical wet analysis and by X-ray investigations. On the basis of these findings it is possible to work out a systematic classification which provides a justification of the classification by types given above. Tests with different waters made in parallel enable the individual types of layers to be correlated with water conditions. The examination of corrosion failures on copper tubes from potable and industrial water systems has shown that defined types of corrosion may by correlated with defined types of surface layers. Finally the authors deal with the causes of corrosion in copper tubing.
    Notes: In Kupferrohren für Trink- und Brauchwasser bilden sich während des Betriebes je nach Wasserverhältnissen unterschiedliche Deckschichten aus.Sie können zunächst makroskopisch in die Typen I bis III unterteilt werden. Durch naßchemische und röntgenografische Untersuchungen wurde die Zusammensetzung der Schichten ermittelt. Hierdurch konnte eine Systematik erarbeitet werden, die die Einteilung nach Typen rechtfertigt.Durch parallele Untersuchungen von Wässern wird es möglich, eine Zuordnung der einzelnen Schichttypen zu Wasserverhältnissen zu geben.Bei der Untersuchung von Korrosionsschäden an Kupferrohren aus Trink- und Brauchwasseranlagen ergab sich, daß bestimmte Korrosionsformen den definierten Schicht-typen zugeordnet werden können. Zur Abrundung wird auf Ursachen für das Auftreten von Korrosion bei Kupferrohren eingegangen.
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    Description / Table of Contents: Influence of copper on the corrosion behaviour of galvanized tubing in warm water systemsTests carried out with tap water (65°C) containing 0.1 to 0.3 mg/l Cu2+ have revealed that copper ions give rise to accelerated corrosion of tube walls. Corrosion takes place in the form of pitting. The intensity and frequency of pits increase as the copper content is increased and the pH value is decreased. Corrosion products formed on the zinc are predominantly a basic zinc carbonate, while copper is found in a coagulated form at the surface or embedded in the surface layer. The copper content of the corrosion products increases as the copper content of the water is increased and may attain up to 12.5%.
    Notes: Versuche mit Leitungswasser (65°C) mit Kupfergehalten von 0,1 bis 0,3 mg/l Cu2+ zeigen deutlich, daß Kupferionen die Korrosion der Rohrwände beschleunigen. Diese Korrosion hat Lochfraßcharakter. Die Intensität der Korrosion und die Lochzahl steigen mit zunehmendem Kupfergehalt und abnehmendem pH-Wert. Bei den auf Zink entstehenden Korrosionsprodukten handelt es sich im wesentlichen um ein basisches Zinkcarbonat; Kupfer findet sich in koagulierter Form an der Oberfläche oder eingebettet in der Deckschicht. Der Kupfergehalt der Korrosionsprodukte steigt mit dem Kupfergehalt im Wasser und kann bis 12,5% erreichen.
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 287-288 
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    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 289-290 
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