Formation of oxide fuels on vt6 alloy in the conditions of anodial polarization in solutions H2SO4

Abstract

We report results of research into a process of electrochemical oxidation of the titanium alloy VT6 in solutions of H 2 SO 4 . It is shown that the character of forming dependences for alloy samples depends on the magnitude of current density. At j 0.5 А·dm –2 , a continuous oxide film forms at the surface of the alloy; a linear character of dependences is observed. The films obtained under these conditions relate to the interferential-colored films. A film thickness limit is defined by the assigned magnitude of U and does not depend on other parameters of the electrolysis. For the series of identical values for U, dependence of τ‒j has a linear shape. The color of the oxide film is determined by the value of voltage and does not depend on the current density and electrolyte concentration. We established a correspondence between a color of the film and the magnitude of U in the range of 10‒100 V. This effect is due to the fact that the formation of a film at anodic polarization occurs in the presence of a gradient in the potential whose quantity for titanium is a constant magnitude. Increasing the assigned magnitude of U leads to a proportional increase in the maximum thickness of the oxide, which determines its color. Results of our study on determining the effect of electrolysis parameters on the characteristics of oxide films made it possible to substantiate the mode for obtaining TiO 2 films at the surface of the alloy VT6. The data obtained form the basis for the development of technology for electrochemical oxidation of titanium implants in order to render functional properties to their surface.