Abstract
The oxidation of pure Co and two Co–Y alloys containing 2 at.% and 5 at.% Y has been studied at 600–800°C in air. The oxidation of pure cobalt at all temperatures followed the parabolic rate law. The oxidation of the two alloys approximately followed the parabolic rate law at 800°C, but was closer to cubic behavior at 600 and 700°C except Co–5Y at 600°C, which deviated from the cubic and parabolic rate law. The corrosion of both alloys at the three temperatures produced an external scale containing Co oxides (Co 3O 4, CoO) and Y 2O 3 and an internal oxidation region where Co 17Y 2 was converted into Co and Y 2O 3. The distribution of Y 2O 3 closely followed that of the intermetallic compound (Co 17Y 2) in the original alloy. The corrosion mechanism of the alloys is examined.
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