Studies on the Oxygen Gradients in Oxidizing Metals
Open Access
- 1 January 1964
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 111 (12) , 1339-1342
- https://doi.org/10.1149/1.2425999
Abstract
Coarse grained hafnium samples were oxidized for times up to 432 hr. A remarkable anisotropy of the oxidation rate was observed which persisted to the thick film region. This effect is associated with a variation in the stoichiometry of the oxide films covering the differently oriented grains. The oxygen gradient beneath the oxide film was measured using a technique involving the rate of dissolution of interference colored oxide films. Experimentally determined gradients are in good agreement with a theoretical expression involving the diffusivity, time, and oxide film thickness.Keywords
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