Abstract
XPS data of thin (1 to 2 nm) oxide films formed by the anodic passivation of Ni-2 at % Cr and Ni-6 at % Cr alloys in 1 N H2SO4 are discussed. Thermodynamic calculations of the solid-phase chemical reaction 3NiO + 2Cr = Cr2O3 + 3Ni are carried out taking into account the changes in the surface energy at the alloy-oxide film interface along with the Gibbs energy change in the alloy oxidation reaction.
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