Effect of galvanostatic condition on growth behavior and repassivation potential of crevice corrosion of duplex stainless steels

So Aoki, Tatsuya Ehashi, Jun'ichi Sakai

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    The purpose of this study is to clarify effect of galvanostatic condition on growth behavior and repassivation potential (ER.CREV) of crevice corrosion of duplex stainless steels. ER.CREV measurements, microscopic observation of corroded area, and solution pH measurements inside crevice were carried out. Under the condition of large holding current in propagation step of ER.CREV measurements, the crevice corrosion grew from the bottom to the edge of crevice. Then, it grew towards depth direction, and the sharp corroded area formed near the edge of crevice. Solution pH inside crevice lowered easily under the condition of large holding current in repassivation step, and it induced the repassivation of corroding crevice at noble potential. It was suggested that the sharp corroded area formed near the edge of crevice under the large holding current condition contributed to lowering corrosivity of solution inside corroding crevice and the repassivation of corroding crevice at the noble potential.

    Original languageEnglish
    Title of host publicationECS Transactions
    Pages105-111
    Number of pages7
    Volume50
    Edition31
    DOIs
    Publication statusPublished - 2012
    EventCorrosion, Passivity, and Energy: A Symposium in Honor of Digby D. Macdonald - PRiME 2012 - Honolulu, HI
    Duration: 2012 Oct 72012 Oct 12

    Other

    OtherCorrosion, Passivity, and Energy: A Symposium in Honor of Digby D. Macdonald - PRiME 2012
    CityHonolulu, HI
    Period12/10/712/10/12

    ASJC Scopus subject areas

    • Engineering(all)

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