Dissolution Behavior of Duplex Stainless Steels in Crevice Corrosion Growth Step

So Aoki, Yushi Nada, Jun'Ichi Sakai

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    The objective of this study is to clarify dissolution behavior of duplex stainless steels in crevice corrosion growth step. Crevice corrosion grew on the duplex stainless steels by holding potential at various values. After a certain period, dissolution behavior of the crevice corrosion was analyzed based on observation of corroded area. Change in crevice corrosion dissolution behavior with time was also investigated by means of in-situ observation. Four types of dissolution regions could be observed in the corrosion area from outside toward inside direction, i.e., tip of the corroded area toward initiation point, in a crevice; they were passive region, the preferential dissolution region of γ phase, α phase and γ phase dissolution region, and the preferential dissolution region of α phase. The crevice corrosion which maintained that four dissolution regions grew toward the edge of the crevice. This dissolution behavior was given at all the potential where crevice corrosion occurred.

    Original languageEnglish
    Pages (from-to)366-372
    Number of pages7
    JournalZairyo to Kankyo/ Corrosion Engineering
    Volume64
    Issue number8
    Publication statusPublished - 2015

    Keywords

    • Crevice corrosion
    • Duplex stainless steel
    • In-situ observation
    • IR drop
    • Potentiostatic test
    • Preferential dissolution

    ASJC Scopus subject areas

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

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