Electronic structure study of ac modified passive film on stainless steel

    Authors

    T. B. Du

    Abbreviated Journal Title

    Br. Corros. J.

    Keywords

    MODEL; IRON; Materials Science, Multidisciplinary; Metallurgy & Metallurgical; Engineering

    Abstract

    The semiconductor properties, electronic structure and reduction susceptibility of passive films on AISI type 304 stainless steel in dilute sulphuric acid solutions hat e been studied by electrochemical impedance spectroscopy measurements, Mott-Schottky analysis and the photoelectrochemical technique. The passive film shows features of an amorphous or highly disordered n type semiconductor. The donor level is in the range of 10(26)-10(27) m(-3) and increases with the amplitude of ac potential. The passive film thickness increases linearly, with the amplitude of the applied ac potential. The reduction susceptibility of the passive film is also decreased with the amplitude of the applied ac. The photoelectrochemical measurements also indicate that the passive film is n type semiconductor and the photocurrent is decreased after ac, modulation. It might be related to the surface chromium accumulation.

    Journal Title

    British Corrosion Journal

    Volume

    37

    Issue/Number

    1

    Publication Date

    1-1-2002

    Document Type

    Article

    Language

    English

    First Page

    18

    Last Page

    22

    WOS Identifier

    WOS:000175463400001

    ISSN

    0007-0599

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