Investigation of the Influence of Technological Regimes of Thermocyclic Electrolyte-Plasma Treatment On The Structural-Phase State and Tribocorrosion Properties of 12Kh1MF Steel

Abstract

This paper presents the results of a detailed study on the influence of thermocyclic electrolyte-plasma treatment on the structural-phase state, microhardness, and tribocorrosion properties of heat-resistant steel 12Kh1MF. The treatment was carried out using a 10 % Na2CO3 aqueous solution and a voltage of 300/150 V. It resulted in the formation of a zonal microstructure with a martensitic surface layer up to 600 μm thick. The structure was divided into zones: hardened, thermal influence, and base material. Microhardness increased by 1.5 times due to martensitic transformation. X-ray analysis confirmed the formation of α′Fe and Fe3C phases. Tribological tests showed a 10 % reduction in the friction coefficient and a 1.5–2-fold increase in wear resistance. Corrosion tests in a salt fog chamber revealed enhanced protective properties, with mass loss reduced and corrosion resistance improved by 10–30 %, depending on the treatment mode. Based on a comprehensive analysis, the most effective thermocyclic treatment mode was identified, ensuring an optimal balance of mechanical strength and corrosion resistance. The findings highlight the high potential of thermocyclic electrolyte-plasma treatment as a promising method for enhancing the surface properties of steel components operating in aggressive environments.