Bulhakova A. Electrodeposition technology of functional coatings Co-Mo, Co-Mo-TiO2.

In the modern electrochemical science, a large number of robots are associated with obtaining and study of physicochemical and functional properties of coatings. Perspective use of such coatings in many areas of industrial activity associated with a unique combination of properties of materials of this class, such as hardness, heat resistance, chemical resistance, electrocatalytic activity, wear resistance, magnetic permeability. The dissertation work is directed on development of technology of reception of a composite covering of Co-Mo-TiO2 with the raised functional properties. The object of research is the processes of electrochemical production of Co-Mo and Co-Mo-TiO2 coatings from complex electrolytes. The subject of the study is the technological parameters and kinetic patterns of electrodeposition of functional coatings Co-Mo and Co-Mo-TiO2 from ammonia-trilonate electrolytes. In the dissertation work the scientific and practical problem of development of processes of electrochemical reception of coverings with the raised functional properties is solved. scientific and practical task of developing processes of electrochemical production of coatings from increased functional properties. The purpose of the work is to develop technology obtaining a composite coating of Co-Mo-TiO2 with elevated functional properties. The research was carried out using both classical and fundamentally new modern methods: the kinetics of cathodic reduction were studied by linear voltammetry (LVA) and impedance spectroscopy; the phase composition of the precipitates was determined according to X-ray phase analysis (X-ray diffraction), the surface morphology and elemental composition of the obtained samples were studied using a scanning electron microscope (SEM); the microhardness of the coatings was determined by Vickers; the catalytic activity of the coatings was tested for hydrogen evolution reactions; corrosion behavior was studied by impedance spectroscopy and polarization resistance. Scientific novelty of the obtained results: - the proposed ammonia-trilonate electrolyte for electrodeposition of composite coating Co-Mo-TiO2 with the possibility management of functional properties of the received sediments; - using a certain amount of activation energy for the first time the limiting stages of deposition of Co-Mo and Co-Mo-TiO2 coatings have been established; - based on studies of the kinetic dependences of the deposition process composite coating of Co-Mo-TiO2 from ammonia-trilonate electrolyte the mechanism of its formation is offered for the first time; - the connection between the mode of electrochemical deposition and structure and composition of the composite coating Co-Mo-TiO2, obtained from ammonium trilonate electrolyte; - the role of titanium dioxide as a modifying additive for ensuring the functional properties of the coating and the established connection between the composition and structure of the sludge and its microhardness, catalytic activity and corrosion resistance; - for the first time technological indicators of electrodeposition are established composite coating and the proposed map of the technological process its receipt. Practical value dissertation work is to use its results: - in the Kharkiv branch of PJSC Ukrnaftohimproekt (Kharkiv) - experimental and industrial tests of samples with metal coating Co-Mo obtained by electrochemical method; - at the National Technical University "Kharkiv Polytechnic Institute "in the development and implementation of the educational process Department of "Technical Electrochemistry" technological instructions for obtaining Co-Mo-TiO2 coating.