Abstract:Nickel based alloy has good corrosion resistance in chloride medium, but its wears resistance is insufficient.In this paper, WC-CoCr coatings were prepared on Inconel617 alloy surface by HVOF (high velocity oxygen fuel). Electron beam remelting process is explored to modify the morphology and the phase composition of the coated layer. Some structural defects of as-sprayed coating have been improved after electron beam treatment. Tribological tests concerning the sliding wear behaviour of the tested materials revealed a significant decrease of the wear rate for the alloyed surface in comparison with the base material. After high energy electron beam treatment, the micro-hardness of the surface is 1100 HV0.3 which is about 2 times as much as the matrix (550HV0.3) due to the formation of new phase (especially the Co6W6C phase) with high hardness, the amount of porosity of the coatings are reduced, and the grain is finer. EDS spectrum analysis found that the process of electron beam cladding elements occurred in the proliferation of cladding layer and the substrate to achieve a good metallurgical bonding. Moreover, the corrosion resistance of the cladding layer in salt water is higher than that of the matrix.