Oxidation Kinetics of a Pb‐3 Atom Percent In Alloy

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Abstract
The solid‐state oxidation kinetics of a single‐phase Pb‐3 atom percent (a/o) In alloy were studied from 22° to 250°C, using Auger electron spectroscopy, combined with argon ion sputtering. At low temperatures, 22° to 150°C, the oxidation followed a direct logarithmic relationship. The data were interpreted in terms of a model presented in this study. The values of the model parameter, predicted from the structural data of the oxide formed, , are within a factor of two of the experimentally determined values. The model was also applied to the oxidation of Pb‐2.5 a/o Sn (1) with equal success. At high temperatures, 175° to 250°C, rapid initial oxidation rates were followed by slower oxidation rates. The data were described quantitively using the model of Smeltzer et al. (6). The parabolic oxidation data, over a longer time, were interpreted in terms of the Wagner model (8, 9). The diffusing species was found to be oxygen in . The low activation energy of was believed to be due to vacant oxygen sites in the oxide lattice.

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