Features of surface scale growth in the process of oxidation of V-Cr-Ta-Zr alloy in air

Investigation results of features of surface scale growth on samples of V-Cr-Ta-Zr vanadium alloy at a short duration of oxidation in air are presented. It is shown that at the initial stages of oxidation, regardless of the samples microstructure, the growth rate of surface scale can be an order of magnitude higher than with long-term processing. It has been established that scale is characterized by open porosity formed as a result of sticking of small plate-like V₂O₅ flakes together. It has been suggested that the decrease in oxidation rate is a consequence of an increase in the scale thickness, which helps to slow down the supply of oxygen to the sample surface on which the processes of nucleation and growth of scales occur, as well as diffusion saturation of the surface layer of the vanadium alloy with oxygen.

Keywords

Authors

References