Karakurkchi H. Scientific and Technological Bases of Plasma-electrolytic Formation of Heterooxide Coatings for Ecotechnologies

The object of research is chemical and electrochemical processes in the volume of electrolyte, oxide coating and interface in the formation of heteroxide coatings on aluminum and titanium alloys. The subject of research is the mechanism of the surface treatment of aluminum and titanium alloys in alkaline solutions of electrolytes, technological parameters of plasma-electrolyte oxidation, composition, structure and functional properties of heteroxide coatings. The purpose of the study is to develop the scientific basis of the technology of plasma-electrolyte formation of heteroxide coatings of a given composition and functional properties for eco-technologies. Research methods ‒ voltammetry, energy dispersion X-ray spectrometry, scanning electron microscopy, scanning probe microscopy, X-ray diffractometry, electrode impedance spectroscopy. Theoretical and practical results – it has been established the regularities and stages of synthesis in one technological process of heteroxide coatings by plasma-electrolyte oxidation of multicomponent alloys of aluminum (titanium) with minimization of the content of their alloying elements, formation of the developed monoxide matrix of carrier metal and incorporation of target additives. It has been developed the various schemes of plasma-electrolyte treatment of multicomponent alloys of aluminum and titanium in solutions of diphosphates with minimization of the content of alloying elements in surface layers and formation of heteroxide coatings with cobalt and manganese with the set functional properties. The novelty –experimentally proven the hypotheses of the aluminum (AK12M2MgN, D16, AMc) and titanium (OT4-1) multicomponent alloys surface homogenization and the formation of a given relief for the oxide matrix of the base material by plasma-electrolytic oxidation in alkaline solutions of diphosphates and synthesis of heterooxide coatings with manganese and cobalt. The influence of composition of electrolytes and plasma-electrolyte treatment on elemental, phase composition and surface morphology of the obtained coatings has been determined. The possibility of controlling the composition, morphology and topography of oxide coatings by varying the composition of the electrolyte and the use of the "decreasing power" mode has been proved. The realization degree consist of the laboratory samples and experimental items with developed coatings pilot test in Kharkiv Research Forensic Center of the Ministry of Internal Affairs of Ukraine, JSC «UKRNDICHIMMASH» and the Department of Internal Combustion Engines NTU «KhPI». The branch of this research application is the technical process of electrochemical production, Research Studies Institutes and а educational process.