RESEARCH OF REGIMES OF APPLYING COATS BY THE METHOD OF PLASMA ELECTROLYTIC OXIDATION ON TI-6AL-4V

Abstract

In this work, ceramic coatings were formed on Ti6Al4V titanium alloy using a technique of plasma electrolytic oxidation. Plasma electrolytic oxidation was carried out in electrolytes with different chemical compositions and the effect of the electrolyte on the macro- and microstructure, pore size, phase composition and wear resistance of coatings was estimated. Three types of electrolyte based on sodium compounds were used, including phosphate, hydroxide, and silicate. The plasma electrolytic oxidation processes were carried out at a fixed voltage (270 V) for 5 minutes. The results showed that the most homogeneous structure with lower porosity and a large amount of crystalline anatase phases was obtained in the coating prepared in the silicate-based electrolyte. The morphology and phase composition of the samples were studied using a scanning electron microscope and an X-ray diffractometer, respectively.