Abstract
The influence of aliovalent impurities on the kinetics and mechanism of manganese and molybdenum sulfidation has been demonstrated, as a function of temperature (1,073–1,273 K) and sulfur pressure (1–104 Pa). The results of these experiments have been considered in terms of Hauffe–Wagner theory of doping, which made it possible to explain the different influence of aliovalent impurities on the sulfidation kinetics of manganese and molybdenum. It has been shown that the same impurity may play both the positive or negative role in the corrosion behavior of a given metal and it is not possible to predict the type of this influence without the detailed knowledge of point defect structure of sulfide or oxide scales and, in particular, of the mechanism of impurity dissolution in the crystallographic structure of oxidation or sulfidation products.
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