Investigation into the Corrosion Wear Resistance of CoCrFeNiAlx Laser-Clad Coatings Mixed with the Substrate

CoCrFeNiAlx (x = 0 and 1.0) high-entropy alloy coatings were synthesized on Ti6Al4V via laser cladding to improve their corrosion wear resistance under corrosive conditions. Results indicated that the coating (CoCrFeNi) was largely composed of irregular primary ?(Ti) honeycomb-like eutectics + Ti2Ni as matrix, with TiC dendrites reinforcement. When Al introduced into material, grains transformed equiaxed grains, besides which area fraction in considerably reduced, also spherical particles. Compared without Al, introduction contributed improvement because potential enhanced from ?0.524 V ?0.393 V, whereas current density steady reduced 2.249 × 10?7 A·cm?2 1.021 10?6 1.260 2.506 A·cm?2, respectively. The substrate still at break-in stage during a long-term sliding 10 h its rate exhibited an approximately linear reduction tendency (2.09 10?3 mm3·N?1·m?1 for 2 7.44 10?4 h). With respect coatings, they transitioned stable when duration exceeded 4 h, comparatively 2.88 obtained. mechanism identified slight microcutting serious oxidation h. It changed combination microcutting, oxidation, moderate brittle debonding coatings. Generally speaking, can refine microstructure microstructural uniformity. Moreover, passive film be formed more rapidly surface presents higher stability introducing Al. Finally, promotes enter causes decrease friction coefficient rate.