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The high temperature (600°–900°C) oxidation of an iron‐nickel alloy containing 42% nickel has been studied with the objective of formulating the mechanism of reaction. The rate was determined gravimetrically. Reaction products were examined by means of metallographic and electron diffraction techniques, as well as chemical analyses after stripping. The temperature dependence of the parabolic oxidation rate constant follows the Arrhenius equation with the parameters dependent on the method of surface preparation. The oxide film, upon cooling, possesses a two‐phase structure consisting of a nickel ferrite (next to the alloy) and . Differences in activation energies and oxidation rates are explained on the basis of diffusion through ferrite structures of a varying percentage of nickel.
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Foley et al. (1955) studied this question.
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