OBTAINING OF A COMPOSITE COATING OF COPPER-MOLYBDENUM (VI) OXIDE WITH CATHODIC POLARIZATION

Abstract

In this paper, considered the ways of obtaining a composite electrochemical coating by entering molybdenum (VI) oxide into the copper matrix in order to improve the physicochemical properties of the copper coating. The influence of electrochemical parameters (solution concentration, current density, concentration of molybdenum (VI) oxide) is investigated with cathodic polarization of a titanium electrode in aqueous solutions of copper sulfate. In the course of studies of the influence of the concentration of a dispersed particle that is part of a copper-molybdenum oxide (VI) composite, it was found that at high concentrations of dispersed particles in solution, the cathode surface is passivated and the optimal concentration of the dispersed component is determined. It was noted that with increasing current density, the amount of molybdenum (VI) oxide penetrating into the copper matrix increases slightly, these data were explained by the charge difference of the  particles, as well as adsorption properties. As a result of the study, a compact composite coating on the cathode in a dispersed suspension of the composite in a solution of copper (II) sulfate was obtained. The results of the physico-chemical analysis of the resulting composite coating showed that 1.2% dispersed molybdenum (VI) oxide entered the copper matrix. As a result of tests of a composite coating made of copper-molybdenum oxide for chemical corrosion, it was found that this coating has high corrosion resistance from a copper coating obtained without molybdenum (VI) oxide. The surface roughness of the coating obtained on the cathode surface was observed in microphotographs. This was explained by the fact that molybdenum (VI) oxide penetrates into the copper matrix in the form of dispersed granules and forms a composite electrochemical shell with a copper coating.