Dissolution behavior of α and γ phases and preferential dissolution mechanism of a duplex stainless steel in a simulated crevice solution

So Aoki, Hiroshi Yakuwa, Matsuho Miyasaka, Jun'ichi Sakai

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    The objectives of this study are to clarify the dissolution behavior of the ferritic phase (α phase) and the austenitic phase (γ phase) of a duplex stainless steel (DSS), and to propose a corrosion mechanism of the DSS through dissolution behavior of either the α phase or the γ phase at corrosion potential, respectively. Just a single phase specimen (α or γ phase specimen) was prepared by using selective dissolution of the DSS. The α phase showed less-noble corrosion potential compared to the γ phase, and passivated at less-noble potential. When the polarization curves of each phase are summed up, the obtained curve showed good agreement with the DSS polarization curve. The α phase of the DSS dissolved preferentially at corrosion potential. Based on these results, a preferential dissolution mechanism model of a DSS is proposed using internal polarization curves of each phase.

    Original languageEnglish
    Pages (from-to)328-332
    Number of pages5
    JournalZairyo to Kankyo/ Corrosion Engineering
    Volume60
    Issue number7
    DOIs
    Publication statusPublished - 2011

    Keywords

    • Austenitic phase
    • Corrosion potential
    • Duplex stainless steel
    • Ferritic phase
    • Polarization curve
    • Preferential dissolution

    ASJC Scopus subject areas

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

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