CORROSION AND MECHANICAL WEAR OF NITROGEN STEELS IN ACID ENVIRONMENTS

Abstract

The work is devoted to the study of the tribological properties of steels and cast iron strengthened by anhydrous nitriding in a glow discharge operating in acidic environments. Electrochemical behavior, wear resistance and corrosion resistance of nitrided surfaces in technological acidic environments have not been sufficiently investigated. Without considering the influence of operational factors on wear conditions leads to premature failure of processing and food industry equipment. The results of the study of corrosion-mechanical wear of nitrided and non-nitrided steels (С20; С45; 37Cr4; 41CrAlMo7) in an acidic model environment are given. The dependences of the intensity of wear and the coefficient of friction on the pressure in the frictional contact and on the sliding, speed was obtained. Results were also obtained on the change in the ratio of corrosive and mechanical wear factors depending on the pressure and sliding speed. The analysis of the effect of the temperature of the surface layers on the tribological properties of nitrided samples operating in an acidic environment was carried out. The influence of temperature and sucrose on the intensity of destruction of surfaces was clarified. The obtained results make it possible to make the optimal selection of hardening modes and operating conditions of nitrided surfaces working in acidic production environments.