Microstructure, corrosive-wear and immersion corrosion performances of laser cladded FeCoNiCr-Mo (Al, Ti) high-entropy alloy coatings

The effects of Mo, Al and Ti additions on the corrosive-wear and immersion corrosion performances of FeCo-NiCr-based coatings were investigated, and the corrosive-wear and corrosion mechanisms were discussed. The results show that the corrosive-wear resistance of FeCoNiCr-Al HEA coating is the highest among the three kinds of coatings, and the corrosive-wear mechanism is combined of abrasive wear, adhesive wear, oxidative wear and pitting corrosion. The immersion corrosion rates of FeCoNiCr-Mo, -Al and -Ti HEA coatings are 6.94 x 10-5, 2.78 x 10-4, and 5.56 x 10-4 m center dot h-1, respectively, and the corrosion mechanism is pitting corrosion by the attack of Cl-.