Change of pH of inside the crevice with time during crevice corrosion initiation and growth step of a duplex stainless steel

Nobuaki Ito, Ryotaro Yamamoto, Jun'ichi Sakai

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    Abstract

    The objective in this study was to clarify the change of pH with time inside crevice in potentiostatic crevice corrosion test. Sensing plate to discoloration by the change of pH was made. The crevice corrosion of a duplex stainless steel in potentiostatic crevice corrosion test using a sensing plate was in situ observation. The change of pH with time inside crevice was measured by discoloration of the coating agent of the sensing plate. Crevice corrosion of duplex stainless steel occurred at the point where pH is lowered locally. And, it was found that pH of crevice corrosion tip was below the depassivation pH of both phases.

    Original languageEnglish
    Pages (from-to)193-196
    Number of pages4
    JournalZairyo to Kankyo/ Corrosion Engineering
    Volume64
    Issue number5
    Publication statusPublished - 2015

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    Keywords

    • Crevice corrosion
    • Depassivation
    • Duplex stainless steel
    • Growth
    • In-situ observation
    • Initiation
    • PH

    ASJC Scopus subject areas

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

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