Abstract
The effects of chromate and vanadate anions on the hot corrosion of preoxidized Ni by a thin fused film in an gas atmosphere at 900°C were investigated by use of a sodium sensor and an oxygen probe. The chromate anion suppressed the sulfidation of Ni probably by precipitating solid from the melt. However, the corrosion rate during self‐sustained hot corrosion was faster than for a pure sodium sulfate melt, probably due to the fast counterdiffusion of species. The vanadate anion rapidly attacked the protective oxide and enhanced the sulfidation of Ni causing a self‐sustained hot corrosion of Ni.
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