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

8 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

Keywords

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

ASJC Scopus subject areas

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

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