Corrosion behavior of carbon steels coupled to stainless steels in sea water

Hirotaka Sato, Toru Yamaji, Jun'ichi Sakai

    Research output: Contribution to journalArticle

    Abstract

    To evaluate the corrosion risk of offshore steel structures at submerged zone caused by stainless steel sheathing and cathodic protection failures, it is essential to grasp the degree of the carbon steel-stainless steel galvanic corrosion. The objective in this study was to clarify the effect of area ratio of stainless steel coupled to carbon steel on corrosion behavior in sea water. As a result, stainless steels promote galvanic corrosion, but the degree of accelerated corrosion was much smaller than that estimated from the area ratio. Calcareous deposits had formed on the surface of stainless steels during galvanic tests in seawater. The calcareous deposits appeared to diminish the diffusion of the dissolved oxygen and diminish the cathodic reaction of oxygen reduction on the stainless steel surface.

    Original languageEnglish
    Pages (from-to)183-187
    Number of pages5
    JournalZairyo to Kankyo/ Corrosion Engineering
    Volume64
    Issue number5
    Publication statusPublished - 2015

    Keywords

    • Calcareous deposits
    • Cathodic protection
    • Corrosion rate
    • Galvanic corrosion
    • Metal sheathing
    • Offshore structure
    • Seawater
    • Stainless steel

    ASJC Scopus subject areas

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

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