E. S. Filatov, N. I. Shurov, K. R. Karimov, E. V. Nikitinа, D. O. Chukhvantsev, N. S. Semenova.
ABSTRACT
Boroning is one of the most effective and promising methods of surface hardening of steel parts of machines and tools operating at high static and dynamic loads. In order to save energy resources and eliminate expensive boron powders, to create a closed cycle for the use of raw materials and wash water, the Institute of High Temperature Electrochemistry Ural Branch of the Russian Academy of Sciences conducted research on the development of technologies for hardening machine parts and tools using electrolysis boronization (electrolysis, electrolysis, cyclic, electrolysis using reverse current) molten salts based on calcium chloride.
The kinetics of the formation of boride coatings on powder steel (GGR) Cr11Ni6Cu15, 20Cr13 in a CaCl2 + 3–5 wt % B2O3 at temperatures of 800, 850 and 900°C and holding times of 1, 2 and 3 hours. The main temperature, concentration and current parameters of the boronation process are determined, which determine the receipt of a high-quality protective coating.
The products of the process of boroning the surface of tool steels in a melt based on calcium chloride with the addition of boron oxide using a reversed current are studied by X-ray phase and micro X-ray spectral analysis. The metallographic method was used to determine the phase composition of the coating from the products of electrolysis boronation. The thickness, microhardness, and phase composition of all obtained boride coatings were determined. The results of boronation of the provided experimental parts allow us to recommend the coating technology for industrial applications.
KEY WORDS:
molten salt, calcium chloride, boron oxide, reverse current, current density, coating, phase composition.
DOI: 10.31857/S0235010621040034