Morphology distribution and corrosion resistance of in-situ TiC/CoCrFeNi high-entropy alloy coating

CoCrFeNiTi_xC_x (x = 0.1,0.2,0.3) coatings were prepared on the surface of Q235 steel by laser cladding. The effects of in-situ synthesized TiC content on the microstructure and properties of the coating were studied by scanning electron microscopy, electron backscatter diffraction, transmission electron microscope and electrochemical corrosion. The results show that in-situ TiC mainly exists in the form of small particles in the matrix, and with the increase of Ti and C content, the distribution of in-situ TiC in the crystal becomes uniform and dispersed. The in-situ precipitated TiC in the coating has an obvious phase relationship with the matrix, TiC[$\overline{1}$00]∥matrix phase [$\overline{2}\overline{1}$0], TiC(00$\overline{2}$)∥matrix phase (1$\overline{2}$0). The electrochemical corrosion performance of CoCrFeNiTi_0.2C_0.2 in 3.5 wt% NaCl solution is good, and the corrosion form mainly exists in the form of grain boundary corrosion and pitting corrosion.