Abstract:Ni60-Y2O3 alloy layers were prepared on the surface of 6063 aluminum alloy by using laser additive manufacturing. The effects of rare earth Y2O3 addition on microstructure, phase structure and corrosion resistance of bonding interface between Ni60-Y2O3 alloy layers and substrate were investigated by means of OM, XRD,SEM and electrochemical corrosion tester. The results show that an excellent bonding between the alloy layers and the substrate was ensued by a strong metallurgical interface. Ni60-Y2O3 alloy layers have less of cracks, holes and porosity, more refined grain size than Ni60 alloy layers which without adding rare earth. The main phase structures of Ni60 alloy layers are β-NiAl (Cr), Al3Ni, AlNi3, Al , etc. After adding rare earth Y2O3, the diffraction peaks of Y2O3、YAl3、AlNiY、Ni17Y2 are found in the Ni60-Y2O3 alloy layers. Electrochemical corrosion tests show that the corrosion resistance of Ni60- Y2O3 alloy layer is 4.07 times as that of Ni60 alloy layer in 1mol/L H2SO4 solution, In 3.5% NaCl solution, the corrosion resistance of Ni60-Y2O3 alloy layer is 4.3 times as that of Ni60 alloy layer; In 1mol/L NaOH solution, the corrosion resistance of Ni60- Y2O3 alloy layer is 2.3 times as that of Ni60 alloy layer. It is visible that adding rare earth Y2O3 make Ni60 alloy layer grain refinement, organizational improvement, and significantly improve the corrosion resistance of the alloy layer.