Abstract
The effect of deviations from the stoichiometric composition of solid-solution oxides formed during the oxidation of a binary alloy is considered by taking into account its influence on the activities of the oxide components using an approximate expression. Calculations carried out for two systems, the Co-Ni and Co-Fe alloys, forming CoO-NiO and CoO-FeO solid-solution scales, show that the effect of this factor on the form of the calculated profile of oxide composition through the scale is negligible in the former case but significant in the latter. Inclusion of this effect in the theoretical treatment for the Co-Fe system yields results that are in better agreement with the experimental data than are those calculated by means of the classic treatment, which neglects this aspect. This finding results from the larger magnitude of the deviation from Stoichiometry in the CoO-FeO system as compared with the CoO-NiO system. In neither case does the nonstoichiometry affect significantly the magnitude of the calculated rate constants.
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Young, D.J., Viani, F. & Gesmundo, F. Parabolic growth of solid-solution scales: Effect of deviations from stoichiometry. Oxid Met 30, 391–403 (1988). https://doi.org/10.1007/BF00659007
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DOI: https://doi.org/10.1007/BF00659007