INFLUENCE OF TECHNOLOGICAL PARAMETERS THE ELECTROCHEMICAL CHROMIATION PROCESS ON THE OPERATIONAL PROPERTIES OF COATINGS

Keywords: electrochemical chrome coating, flowing electrolyte, technological parameters, long details, automated control system, roughness, microhardness, wear

Abstract

The analysis of chrome plating methods to increase the wear-resistance and corrosion resistance of replaceable parts of the hydraulic part of piston pumps: piston rods, rod extensions, plungers and cylinder bushings. Reasoned the advantages of using electrochemical chrome plating of parts in a flowing electrolyte with nanoadditives, which provides wear-resistant coatings with stable surface quality indicators and high physical and mechanical properties. An automated control system has been developed which provides maintain at a given level the technological parameters of the electrochemical chromium plating process in a flowing electrolyte: the ratio of concentrations of electrolyte components, flow rate, current density and electrolyte temperature, and also allows to control the value of the water index of the electrolyte and its electrical resistance. The application of a chromium coating of a standard electrolyte with nanoadditives on the 40HN steel samples, which were surface hardened and ground, have investigated. Surface roughness, thickness and microhardness of coating were determined. Chrome-plated samples were tested for wear during reciprocating motion. The value of wearing was determined by gravimetric method. Statistical results of the experiment were performed using correlation-regression analysis. The effect of mass ratio of concentrations of electrolyte components, current density, electrolyte flow rate and electrolyte temperature on the value of roughness, microhardness and wear of coatings was investigated. Second-order regression models that describe the dependences of the surface roughness, microhardness and wear of chrome coatings on the technological parameters of the process was constructed. Increasing a ratio of the concentrations of the electrolyte components, flow rate and current density leads to a decrease in roughness, and an increase in the electrolyte temperature causes an increase in the roughness of the chromium coating was established. Technological parameters of the chromium plating process have almost the same effect on increasing the microhardness and reducing the wear of the coating, and the introduction of aluminum nanooxides in the chromium coating leads to an increase in its microhardness and, accordingly, reduce wear.

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Published
2021-09-30
How to Cite
Ropyak, L. Y., Shovkoplias, M. V., Vytvytskyi, V. S., & Striletskyi, Y. Y. (2021). INFLUENCE OF TECHNOLOGICAL PARAMETERS THE ELECTROCHEMICAL CHROMIATION PROCESS ON THE OPERATIONAL PROPERTIES OF COATINGS. Bulletin of Sumy National Agrarian University. The Series: Mechanization and Automation of Production Processes, (3 (45), 48-56. https://doi.org/10.32845/msnau.2021.3.7