Abstract
This paper presents a general analysis of the effect of impurities on oxidation kinetics of alloys. From kinetic studies performed in the stability range of oxide solid solution it is shown that it is possible to follow a step in the complex mechanism of oxidation. This has allowed us to analyse the mass transport process in the oxidation layer independently of other transport processes occuring during the scale thickening. Such analysis has allowed us to explain the effect of impurities both on the shift velocity of the oxidation front in the material and on the kinetic demixing of the cations. It is shown that these effects are directly related to the relative diffusion coefficient values of the different cations in the oxide layer.
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