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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Oxidation of metals 3 (1971), S. 41-58 
    ISSN: 1573-4889
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation of an Fe-12% Ni alloy has been studied at 700–1000°C using thermogravimetric, metallographic, and electron probe microanalysis techniques. At all temperatures parabolic kinetics were observed and the activation energy for the process was 48±4 kcal mole−1. At 700°C Fe3O4 and Fe2O3 were present in the external scale and scaling was accompanied by a progressive Ni enrichment of the underlying alloy. When the Ni-enriched zone contained 50–60% Ni, this metal entered the spinel phase, eventually leading to the formation of NixFe3−xO4 where x had a value of ∼0.24 close to the alloy and 〈0.01 close to the Fe2O3 phase boundary. At higher temperatures (900–1000°C) Ni entered the spinel phase very early in the oxidation process. There was a buildup in Ni concentration in the NixFe3−xO4 phase to x values of ∼0.4 and at 900°C only this corresponded to a transition to a lower parabolic rate of oxidation. The internal oxide phase was identified as Ni0.7Fe2.3O4. The mechanism of oxidation of the alloy is discussed in the light of present knowledge concerning the Fe-Ni-O system.
    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 22 (1971), S. 998-1008 
    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: Application of the electron microprobe to the investigation of the influence of surface pretreatment on the progress of phosphatation and electrophoretic coatingA general discussion is presented of the possibilities available for analyzing micro regions on solids with the aid of the microprobe. Along the same lines a survey is presented concerning the range of applications of this method of analysis in connection with the chemical pre-treatment processes of metal Surfaces. The principle of action of the electron microprobe, the method of analysis and the specimen preparation are dealt with. It is shown, that the electron microprobe is a useful means for studying the influence of pretreatments on the structure and formation of phosphate and organic coatings. In the case of the analysis Of the phosphating process, however, the can be interpreted more easily when supplemented by results of X-ray structural analysis. The distribution of Fe, P, Mn, Zn and Ni across the section of the coating has been determined and a hypothetical mechanism of phosphating has been formulated thereupon; the ac-of Ni2+ ions has been explained as well. It has been shown, that components of the substrate as well as of the coating are dissolved during the electrocoating process and are incorporated in the organic coating. This process has a great importance with respect to colour and protective properties of the coatings and with respect to the turn-over of the electrolyte.
    Notes: Der Aufsatz bringt eine allgemeine Be-sprechung der Möglichkeiten der Analyse der Mikrogebiete won Feststoffen unter Anwendung der Elektronen-Mikrosonde. Eine Übersicht über den Anwendungsbereich dieser Analysenmethode zur Untersuchung der Prozesse der chemischen Vorbehandlung von Metalloberflächen wurde ebenfalls dargestellt. Das Wirkungsprinzip der Elektronen-Mikrosonde, die Untersuchungsmethodik und das Vorbehandlungsverfahren von Proben wurden angegeben.Es wurde bewiesen, daß die Elektronen- Mikrosonde ein nützliches Hilfsmittel zur Untersuchung des Einflusses der Vorbehandlung auf den Aufbau und die Bildung won Phosphat- und von organischen Überzügen bilden kann. Jedoch bei der Analyse des Phosphatierungsverfahrens ist die Interpretation der erhaltenen Ergebnisse Leichter, wenn sie mit Ergebnissen der röntgenographisch-strukturellen Untersuchungen ergänzt werden. Die Verteilung won Fe, P, Mn, Zn und Ni im Überzugsquerschnitt wurde bestimmt und auf dieser Grundlage der hypothetische Mechanismus der Phosphatierung wie auch die beschleunigende Wirkung won Ni2+-Ionen angegeben. Es wurde bewiesen, daß sich die Bestandteile sowohl des Haftgrundes wie auch des Überzugs während der elektrophoretischen Beschichtung auf-lösen und in den organischen Überzug übergehen. Dieser Vorgang hat eine wesentliche Bedeutung in Bezug auf die Farbe und die Korrosionsschutzeigenschaften, wie auch auf die Beständigkeit (turnover) der Badflüssigkeit.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
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