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 language | English |
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Pages (from-to) | 162-168 |
Number of pages | 7 |
Journal | Corrosion Science |
Volume | 134 |
DOIs | |
Publication status | Published - 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)