Inhibition of Oxidation of Iron in Environments Containing Chlorine at 1100 and 1200 K

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Abstract
The oxidation of iron in gas mixtures consisting of Ar, , and at 1100 and 1200 K has been investigated by thermogravimetric analysis and examination of the corrosion products of the process by scanning electron microscopy and x‐ray diffraction analysis. The results of the experiments have been compared with theoretical corrosion rates calculated from a model which accounts for the formation of an iron oxide scale according to a parabolic rate equation and the formation of volatile chloride reaction products according to a linear rate equation. The results indicate that the rate of oxidation of iron in this temperature range is significantly inhibited by the presence of chlorine in the environment. This effect is attributed to the formation of a dense layer of on the outside of the oxide scale which is formed in the presence of chlorine.
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