Abstract
A differential method for obtaining the number of component atoms in surface atomic layers is applied to the analysis of thin anodic films on Fe-30Cr alloy surfaces in aqueous solutions. The surface excess, Γ Cr, Γ O and Γ S on dividing surface with Γ Fe ≈ 0 is estimated from the measured in-depth composition profiles. The values of Γ Cr and gG O depend on the anodic potential and the electrolyte used for the film formation. In particular, the ratio of Γ Cr to Γ O is higher in 0.5M sulfuric acid solution than in borate solution of pH 6.48. Furthermore, the validity and usability of the present method is proved by comparing the measured values of the number density of metal atoms in the anodic oxide films with the known values of stoichiometric oxides and hydroxides of iron and chromium.
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