Formation of Coatings on Titanium Alloys Saturated with Biocomponents by the PEO Method

Abstract

In the work, the influence of the composition of the electrolyte on the elec-trophysical parameters of the synthesis of coatings with increased biocom-patible properties was studied. It was established that under conditions of increased electrolyte concentration, the voltage at which the coating is syn-thesized decreases. This effect can be explained by the thermodynamic Gibbs conditions. According to these conditions, the system needs more energy when the medium contains more elements, which must also con-sume a certain amount of energy. The authors found that sodium salts in-crease the conductivity of the working environment. This effect affects the speed of the synthesis process and can reduce the cost of the energy re-serve of the system as a whole. Spectral analysis established that during the synthesis of a titanium alloy in an alkaline electrolyte, an equilibrium non-degenerate quasi-ideal plasma is realized in the discharge channel with a temperature of (1...1,1)×104 K and an electron density of (3,2...3,4)×1022 m-3. It is under these conditions that molecules dissociate into ions and interact with the components of the elec-trolyte, which leads to oxidation of the surface of valve metals and the formation of stable compounds with high biocompatible properties.