Влияние состава электролита на процесс электролитно-плазменного полирования титановых сплавов

Abstract

Electrolyte-plasma polishing (EPP), also known as electrolyte-plasma treatment (EPT) has become widespread in industry as an alternative to traditional chemical, electrochemical and mechanical methods of improving the surface quality of products made of metallic materials. EPP is an innovative technology used to obtain metal surfaces with low roughness and a high gloss. Electrolyte-plasma polishing is widely used in aerospace, biomedical, precision instrumentation and other. This work is devoted to the study of the effect of the electrolyte composition on achieving the effect of polishing titanium alloys during the implementation of the EPP process. The studies were carried out on the example of polishing a titanium alloy VT6 (Ti – 6 Al – 4 V) in a three-component aqueous electrolyte containing NaF, NH2OH·HCl and KCl. It was shown that, depending on the concentration ratio of NaF and NH2OH·HCl protolyte salts, either the formation of oxide films or their anodic dissolution in the presence of a ligand can be observed on the treated surface, with the production of a clean, non-anodized metal surface, accompanied by a decrease in roughness (polishing effect). It is established that the polishing effect is achieved at a certain ratio of NaF and NH2OH·HCl, which ensures the formation of hydrogen fluoride in it in an amount sufficient to dissolve the oxide films formed on the treated surface.