Effect of Al content on wear and corrosion resistance of Ni-based alloy coatings by laser cladding

Inconel 625 + x Al (x = 0, 2.5, 5.0, 7.5, 10.0) alloy coatings were prepared by laser cladding. The addition of Al promoted the formation of the BCC phase, which changed the coating microstructure from an FCC + δ phase + Laves phase to FCC + BCC + δ phase + Laves phase. Inconel 625 + 2.5 Al alloy showed the greatest corrosion resistance among all samples. The formation of an Al2O3 film improved the corrosion resistance of the coating, but excess...