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Oxidation of Iron–Chromium Binary Alloys

Abstract

RECENT results1 show that for the oxidation of iron–chromium alloys containing 16–38 per cent chromium, in oxygen at atmospheric pressure, the process is controlled by diffusion during the first 2 h of exposure at temperatures between 650° and 950° C. The parabolic rate constants, derived from the linear relationship between the square of the gain in weight and time, showed the expected increase with increase in temperature, but there seemed to be an unexpected minimum in the rate, as a function of alloy composition, at about 20 per cent chromium, as shown in Fig. 1. The same trend is shown by weight gain values after longer periods of oxidation and also by the results of another, less detailed study of iron–chromium oxidation2. There is also some evidence that the minimum shifts slightly from 20 per cent chromium to higher chromium contents at lower oxidation temperatures.

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FOOTNER, P., HOLMES, D. & MORTIMER, D. Oxidation of Iron–Chromium Binary Alloys. Nature 216, 54–56 (1967). https://doi.org/10.1038/216054a0

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