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  • 1
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Zinc and zinc-nickel (13% Ni) electrodeposits were passivated by dipping in chromate baths and characterized by scanning electron microscopy. The corrosion behaviour was studied using a.c. electrochemical techniques; electrochemical impedance spectroscopy (EIS) measurements were performed at open circuit and under galvanostatic control during the 24 h immersion time. In sodium chloride solution the zinc-nickel electrodeposits show a better corrosion resistance compared to the pure zinc coatings. During the immersion time, a surface nickel enrichment was observed which, together with the zinc corrosion products, acts as a barrier layer reducing the total corrosion rate. In the same solution the passivation treatment improves the corrosion resistance of the electrodeposits; nevertheless, on zinc substrates, the protection exerted by the chromate film is not, always effective during the immersion time. On the contrary the chromate coating on zinc-nickel substrates induces a remarkable and durable improvement of the corrosion resistance reducing the zinc dissolution almost completely. In the ammonium sulphate solution, the corrosion mechanism is significantly influenced by hydrogen reduction on the zinc-nickel surfaces, and by the production of a local surface acidity which is aggressive for the chromate coatings.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 43 (1992), S. 447-452 
    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: Elektrochemische Charakterisierung von vakuumgesintertem, kupferlegiertem nichtrostendem austenitischem StahlZiel der vorliegenden Arbeit ist die Untersuchung des elektrochemischen Verhaltens und der Korrosionsbeständigkeit von kupferhaltigem, vakuumgesintertem nichtrostendem Stahl. Kupfer kann die Passivierbarkeit und infolgedessen auch die Korrosionsbeständigkeit von gesintertem nichtrostendem Stahl verbessern. Dazu kommt, daß es das Vakuumsintern ermöglicht, Werkstoffe mit guten chemischen und mechanischen Eigenschaften ohne Wechselwirkung zwischen dem Metall und der Sinteratmosphäre herzustellen. Untersucht wurde das Mikrogefüge und die Verdampfung des Kupfers während des Sinterns, wobei auch gezeigt wurde, daß Kupfer in den Stählen 304 L und 316 L unterschiedlich löslich ist. Dieser letzte Befund hängt mit der Stabilität der Oberflächenoxide der Stähle im gesinterten Zustand zusammen.Das elektrochemische Verhalten in sauren Medien zeigt Unterschiede je nach dem Kupfergehalt und seinem Vorhandensein in fester Lösung. Diese Ergebnisse wurden mit ähnlichen Messungen an Knetwerkstoffen oder an in stickstoffhaltiger Atmosphäre gesinterten Proben verglichen.
    Notes: The aim of this work is the study of the electrochemical behaviour and corrosion resistance of copper alloyed vacuum sintered stainless steel. The presence of copper can improve the passivability of sintered stainless steel and, as a consequence, the corrosion resistance; moreover, vacuum sintering allows materials with good chemical and mechanical properties to be produced, avoiding the interaction between the metal and the sintering atmosphere. Microstructural characterization was carried out: copper evaporation during sintering and a different solubility of copper in AISI 304L and AISI 316L were indicated. This last result was related to the surface oxides stability of the steels in the sintering condition.The electrochemical characterization in an acid environment showed different behaviour as a function of the copper amount and of its presence as solid solution. These results were compared with similar measurements of wrought materials or samples sintered in a nitrogen-containing atmosphere.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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