Abstract
During the growth of the most-stable oxide BOv in the oxidation of binary alloys containing nonnoble components A and B, the oxygen pressure prevailing at the alloy-scale interface is higher than the corresponding value for equilibrium between BOv and pure B. The effects of this change on the rate constant for the growth of BOv and on the critical concentration of B in the bulk alloy required for the stability of BOv on its surface are examined and discussed. The general treatment is then applied to the growth of NiO on Cu−Ni alloys and of Cr2O3 on Fe−Cr, Co−Cr, and Ni−Cr alloys by using appropriate defect models for these oxides, considering also the possibility of oxide doping.
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