Microstructure and Corrosion Resistance of Laser Cladding Layer 2%CeO_2/Ni60A on Aluminum Alloy Surface

A 2wt%CeO2/Ni60 A cladding layer on 6063 aluminum alloy surface was prepared using laser cladding technology,the microstructure,microhardness and corrosion resistance of the cladding layer were studied and compared with those of Ni60 Acladding layer and 6063 aluminum alloy.The results show that,comparing with Ni60 Acladding layer,2wt%CeO2/Ni60 Acladding layer had more uniform microstructure,smaller size grains and fewer structure defects(such as pore),and some hard phases,such as Cr3C2,Fe2 C,SiC and Fe23(C,B)6also were found.The microhardness of 2wt%CeO2/Ni60 Acladding layer was higher than that of Ni60 Acladding layer at the same depth positions and the maximum of its hardness was 1 180 HV.In three kinds of corrosion solutions,1mol·L-1 H2SO4 solution,3.5wt% NaCl solution and 1 mol·L-1 NaOH solution,the corrosion resistance of2wt%CeO2/Ni60 Acladding layer was much better than that of Ni60 Acladding layer and 6063 aluminum alloy.