The results of a study of features of the surface scale growth on the V–Cr–Ta–Zr vanadium alloy specimens during short-term oxidation in air are presented. It is shown that in the initial oxidation stages, irrespective of the specimen microstructure, the surface scale growth rate can be an order of magnitude higher than that in the course of long-term treatment. It is found out that the scale is characterized by open porosity formed as a result of sticking of the V2O5 plate-like flakes together. It is suggested that a decrease in the oxidation rate is a consequence of an increase in the surface scale thickness, resulting in a slower supply of oxygen to the specimen surface on which the processes of scale nucleation and growth, as well as diffusion saturation of the subsurface vanadium-alloy layer with oxygen are observed.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 11, pp. 75–80, November, 2020.
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Smirnov, I.V., Grinyaev, K.V., Ditenberg, I.A. et al. Special Aspects of the Surface Scale Growth during Oxidation of V–Cr–Ta–Zr Alloy in Air. Russ Phys J 63, 1916–1921 (2021). https://doi.org/10.1007/s11182-021-02251-3
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DOI: https://doi.org/10.1007/s11182-021-02251-3