Abstract
The oxidation behavior of Ni-28W-6Cr-(0–0.190 wt%)Ce alloys at 850 °C was investigated. The addition of Ce significantly decreases the oxidation rate of the alloys and the thickness of the inner oxide scale when the Ce content is below 0.023 wt%. Then the decrease slows down when the Ce content reaches 0.190 wt% due to the consumption of Ce in the γ matrix caused by the formation of Ni-Ce phase. Ce is solid-soluted in the inner oxide NiWO4 and replaces the Ni2+ by Ce with the valence of + 3 and + 4, therefore, the formation of oxygen vacancies and oxygen diffusion are inhibited.
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