Abstract
xW-Ni (x = 60, 70, 80, 90 wt%) coatings were prepared by laser cladding on the surface of X80 steel substrate to explore the effects of different W contents on the microstructure, corrosion resistance, microhardness and corrosion-wear properties of the WNi coatings. The results revealed that the microstructure of the various WNi coatings composed of W and γ (Ni, Fe) phases. The increase in W content resulted in more W atoms being dissolved in the γ (Ni, Fe) phase, enhancing the solid solution strengthening effect, which increased the average microhardness of the coating. Moreover, the addition of W provided diffusion channels for metal ions to migrate to the surface of the coating for passivation film formation, which improved the corrosion resistance of the coating. However, the addition of excessive amounts of W caused the coating density to decrease and accelerated galvanic corrosion. The 80 W-Ni coating among the studied coatings exhibited excellent corrosive-wear resistance due to its high hardness and good corrosion resistance. This coating corrosive-wear mechanism was the combination of abrasive wear and corrosion.
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