High temperature oxidation of Co-W electroplated type 430 stainless steel for the interconnect of solid oxide fuel cells

Lu Gan, Hideyuki Murakami, Isao Saeki

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    Cobalt–tungsten alloy layer containing 2.4 at% W was electroplated on type 430 stainless steel (Fe–16 mass% Cr), and it was subjected to high-temperature oxidation at 800 °C in Air–3 vol% H2O atmosphere for 1000 h. A five-layered oxide of Co3O4, FeCo2O4, CoWO4, (Co,Fe,Cr)3O4, and Cr2O3 formed within 1 h, and the structure retained up to 1000 h. The outward diffusion of Cr3+ was effectively prevented by the CoWO4 layer. In the oxide, Co and W exist as divalent and hexavalent ions respectively, and there is no trivalent cation sites or trivalent cation vacancy through which Cr3+ diffuses.

    Original languageEnglish
    Pages (from-to)162-168
    Number of pages7
    JournalCorrosion Science
    Volume134
    DOIs
    Publication statusPublished - 2018 Apr 15

    Fingerprint

    Thermooxidation
    Stainless Steel
    Solid oxide fuel cells (SOFC)
    Oxides
    Cations
    Stainless steel
    Positive ions
    Vacancies
    Ions

    Keywords

    • A. Stainless steel
    • B. SEM, XRD
    • C. High temperature corrosion

    ASJC Scopus subject areas

    • Chemistry(all)
    • Chemical Engineering(all)
    • Materials Science(all)

    Cite this

    High temperature oxidation of Co-W electroplated type 430 stainless steel for the interconnect of solid oxide fuel cells. / Gan, Lu; Murakami, Hideyuki; Saeki, Isao.

    In: Corrosion Science, Vol. 134, 15.04.2018, p. 162-168.

    Research output: Contribution to journalArticle

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    abstract = "Cobalt–tungsten alloy layer containing 2.4 at{\%} W was electroplated on type 430 stainless steel (Fe–16 mass{\%} Cr), and it was subjected to high-temperature oxidation at 800 °C in Air–3 vol{\%} H2O atmosphere for 1000 h. A five-layered oxide of Co3O4, FeCo2O4, CoWO4, (Co,Fe,Cr)3O4, and Cr2O3 formed within 1 h, and the structure retained up to 1000 h. The outward diffusion of Cr3+ was effectively prevented by the CoWO4 layer. In the oxide, Co and W exist as divalent and hexavalent ions respectively, and there is no trivalent cation sites or trivalent cation vacancy through which Cr3+ diffuses.",
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