Effects of TiC mass fraction on microstructure, corrosive–wear and electrochemical properties of laser cladded CoCrFeNiMo high–entropy alloy coatings

TiC reinforced CoCrFeNiMo high–entropy alloy coatings were fabricated on Ti6Al4V alloy by laser cladding, and the effects of TiC mass fraction on the microstructure, corrosive–wear and electrochemical properties were investigated. The results show that the laser cladded CoCrFeNiMo–TiC coatings consist of TiC, FeTi, Fe3Mo and Fe3C phases, and the hardness and forming quality were improved by the addition of TiC. The wear rates of CoCrFeNiMo–TiC coatings are decreased with the increase of TiC mass fraction, and the CoCrFeNiMo–20%TiC coating presents the highest corrosive–wear resistance. The corrosive–wear mechanism is primary abrasive wear, accompanied with adhesive wear, oxidative wear and pitting corrosion. Moreover, the CoCrFeNiMo–20%TiC coating has the best corrosion resistance, which is attributed to the addition of TiC.