STUDIES OF THE STRUCTURAL AND PHASE STATE OF DETONATION COATINGS BASED ON THE FE–TIB₂–CRB₂ EUTECTIC SYSTEM AFTER PULSE PLASMA TREATMENT

Abstract

Fe–TiB₂–CrB₂ coatings obtained by detonation spraying were modified by pulsed plasma treatment (PPT) to improve their structural and opera­tional properties. A comprehensive analysis of the phase composition, microstructure, microhardness, wear resistance, and corrosion beha­viour was performed. X-ray structural analysis confirmed the preser­vation of the α-Fe, TiB₂ and CrB₂ phases after treatment, with a simul­taneous decrease in the proportion of γ-Fe and Cr₂₃C₆ and a redistri­bution of boride phases. Electron microscope studies revealed a densifi­cation of the surface layer and a decrease in interlamellar porosity. Microhardness in the near-surface zone increased from ~15 to 17–18 GPa (by 15–20%), indicating local strengthening. Tribological tests showed a decrease in wear depth, while electrochemical studies revealed a positive shift in corrosion potential by 0.15–0.20 V and a decrease in the rate of anodic dissolution. PPT provides an improvement in mechanical and corrosion characteristics without changing the basic phase composition of the coating.