Abstract
The influence of x-ray radiation on the protective properties of ZnNi/SiO2 composite coatings has been investigated experimentally, and the optimal regimes of their electrodeposition on irradiation by the method of complete factor experiment have been revealed. It is shown that the action of x-ray radiation on the electrolytes used for electrodeposition of ZnNi/SiO2 leads to an increase in their dispersive power, which makes it possible to form composite coatings with the metal uniformly distributed over the surface and, correspondingly, with elevated corrosion resistance. It has been found that the action of x-ray radiation on the process of electric deposition of ZnNi/SiO2 coatings promotes formation of layers with enhanced anticorrosion properties. Based on experimental data and according to the method of complete factor experiment, the influence of variations in the x-ray radiation exposure dose power and concentration of SiO2 nanoparticles in the electrolyte on the dispersive power of electrolytes and corrosion resistance of ZnNi/SiO2 coatings has been considered. Regression equations have been obtained, an analysis of the coefficients of which allowed the conclusion that a maximum increase in the dispersive power and a decrease in the rate of appearance of corrosion products on ZnNi/SiO2 coatings are achieved on combination of two factors: addition of SiO2 nanoparticles to the electrolyte and irradiation of the electrolyte by x-ray radiation in the process of coating deposition. The developed statistical model allows one to adequately determine the optimal concentrations of SiO2 nanoparticles in an electrolyte and the regime of x-ray irradiation for obtaining coatings with enhanced anticorrosive properties.
Highlights
At the present time, the methods of electrochemical deposition occupy the most important place in protecting metals form corrosion, which is explained by their such substantial advantages over other methods as the simplicity of the process and relatively inexpensive equipment
It has been revealed that the x-ray radiation acting on an electrolyte in the course of electrodeposition leads to an increase in the dispersive power of all of the electrolytes studied
The regression equations for the dispersive power of electrolytes under x-ray irradiation and the time of appearance of corrosion products on the metal protected by a composite coating in absolute values have the form
Summary
The methods of electrochemical deposition occupy the most important place in protecting metals form corrosion, which is explained by their such substantial advantages over other methods as the simplicity of the process and relatively inexpensive equipment. To solve the problems of protecting metals and metalwork against corrosion for the purpose of increasing their service life in corrosive media, it is important to improve the technological processes of obtaining coatings and, in particular, those based on zinc. These coatings owe their protective properties to the fact that the electrochemical potential of zinc is much smaller for ferrous metals and, as a consequence, the protection by zinc-containing coatings is achieved by electrochemical means. The method of action of x-ray radiation on the electrochemical system in the process of deposition of composite coatings prevents the adsorption of oxide and hydroxide films on the substrate surface. Under the influence of x-ray radiation, due to the radiolysis, active radicals originate in the electrolyte that favor the natural mixing of a b c
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