TRIBO-CORROSION RESISTANCE OF CARBON STEELS WITH ARC-SPRAYED COATINGS USING POWDER ELECTRODES 60Х15Р2ГС AND 75X19Р3С2
DOI:
https://doi.org/10.31734/agroengineering2019.23.117Keywords:
electro arc coatings, corrosion, tribocorrosion, chlorides, hydrogen sulfide, ammoniaAbstract
The article is devoted to the study of electro arc coatings, deposited on steel from powder wire electrodes 60Х15Р2ГС and 75X19Р3С2. The coatings have a heterogeneous structure, which consists of a martensitic matrix, strengthened by finely dispersed inclusions of FeCrB and FeCr2B borides. Hardness of the coatings with PW 60Х15Р2ГС constitutes 560 HV, whereas PW 75X19P3C2 – 545 HV. The corrosion and tribocorrosion characteristics of coatings were studied in the following solutions: 3 % NaCl; 3 % NaCl + 0,025 % (NH4OH) and 3 % + Н2S(sat.). In the solutions, the corrosion currents of coatings decrease, when pH changes from 4 to 9. It is explained by the stability of the coating components in neutral and alkaline environments. In the hydrogen sulfide medium, sulfur-contained films are formed on the surface, which act as a solid lubricant during friction, and reduce the adhesive component of the contact interaction. It supports reducing of the friction coefficients and material wear. In the ammonia environment, hard nitrogen-containing films are formed in the contact area. It increases the coefficient of friction. In 3 % NaCl, the corrosion resistance of coatings is the lowest one. In the environment, chlorine ions accelerate the corrosion of coatings, and the combined effect of corrosion and mechanical factors during friction leads to a decrease in wear resistance.
Sulfide- and nitrogen-containing secondary structures are formed on the surface of the gas-thermal coating in corrosive environments. These films can significantly reduce the negative impact of both corrosion and tribological factors. It is shown that the coating, which is obtained by electric arc spraying from PW 75X19Р3С2, has better corrosion and tribocorrosion resistance. Its corrosion resistance, in particular, is provided by a high content of chromium, which rieaches 19%. The presence of carbide and boride phases in the electro arc coatings provides increased hardness and wear resistance of coating.
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