TIG Cladding + Laser Remelting of ZrAlNiCu Amorphous Coating

The present investigation focused on a new amorphous coating preparing technique which combined the advantages of both TIG arc and laser beam. After Zr63.8Ni17.2Al11.4Cu7.6 powder bed was cladded on carbon steel surface by TIG arc, the coating was remelted using a CO2 laser. The microstructure, the phase composition, the microhardness and the corrosion resistance of the present coating were analyzed. TIG arc helps the coating achieve a good bonding with substrate and a homogenous solidification. While laser beam contributes to a quick cooling rate to form an amorphous structure. The coating microstructure is complex, consisting of crystalline phase and amorphous phase. The XRD demonstrates a higher amorphous volume fraction of the present coating compared with traditional laser cladding. The present coating is 1330 MPa higher in microhardness, 0.07 V higher in corrosion potential and more than 10 times lower in corrosion current than traditional laser cladding.