Effect of stability of passive film on resistance of rust staining of stainless steels

Hiroyuki Fuji, So Aoki, Tomohiro Ishii, Jun'ichi Sakai

    Research output: Contribution to journalArticle

    Abstract

    This study focused on a breakdown of passive film which is followed by rust staining, and the objective of this study was to clarify the effect of stability of passive film on the resistance of rust staining of stainless steels. Atomospheric exposure test was carried out for 12 months. In order to compare the stability of passive film, measurements of potential-decay curves, and potentiostatic polarization tests were performed in acidic aqueous chloride solution. As a result, rust area of austenitic stainless steel was higher than that of ferritic stainless steel. This order didn't follow the orders of pitting potentials and densities of inclusions on surface between specimens. On the contrary, the order of the resistance of rust staining of stainless steels followed the order of the stability of passive film. One of the reasons why the resistance of rust staining of austenitic stainless steel was worse than that of ferritic stainless steel was seemed that chloride more easily broke passive film on the surface of austenitic stainless and formed micro pits which become initiations of rust staining and increase density of stains.

    Original languageEnglish
    Pages (from-to)178-182
    Number of pages5
    JournalZairyo to Kankyo/ Corrosion Engineering
    Volume64
    Issue number5
    Publication statusPublished - 2015

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    Keywords

    • Atmospheric corrosion
    • Inclusion
    • Passive film
    • Pitting corrosion
    • Rust staining
    • Stainless steel

    ASJC Scopus subject areas

    • Electrochemistry
    • Materials Chemistry
    • Metals and Alloys
    • Surfaces, Coatings and Films

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