STP596

    Composition of Protective Films Formed on Iron and Stainless Steels

    Published: Jan 1976


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    Abstract

    The composition of passive films formed on austenitic stainless steels have been determined using Auger electron spectroscopy. The films were found to be enriched in chromium which is consistent with the understanding of the relative insolubility of chromium compared to that of iron and nickel. However, the films were depleted in both silicon and molybdenum which are thermodynamically more stable than chromium in the solutions used. Thus, it is not possible to rationalize the improved resistance to acid solutions and solutions containing chlorides obtained by the addition of silicon and molybdenum to stainless steels using a selective-dissolution-enrichment model.

    Keywords:

    spectroscopy, iron, stainless steels, protective coatings, chemical analysis


    Author Information:

    Lumsden, JB
    Adjunct assistant professor and professor, The Ohio State University, Columbus, Ohio

    Staehle, RW
    Adjunct assistant professor and professor, The Ohio State University, Columbus, Ohio


    Paper ID: STP39059S

    Committee/Subcommittee: E42.03

    DOI: 10.1520/STP39059S


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