Effect of WC-10Co-4Cr Reinforcement Amount on Wear and Corrosion Resistance of Fe-Based Amorphous Coatings

WC-10Co-4Cr/Fe-based amorphous composite coatings with different WC-10Co-4Cr powder contents (0-12 wt.%) were prepared on C45 steel by plasma spraying. The microstructure, hardness, wear resistance and corrosion resistance of the WC-10Co-4Cr/Fe amorphous composite coatings were studied. The results show that, with the increase of WC-10Co-4Cr mass fraction, the microhardness and the porosity decrease firstly and then increase slightly. The study of the wear resistance shows that the wear resistance of the WC-10Co-4Cr/Fe-based amorphous composite coatings is higher than that of the single iron-based amorphous coating, and the wear resistance of the 9 wt.% WC-10Co-4Cr/Fe-based amorphous composite coating is the highest, which is about 1/4 of the wear rate of the sing-based amorphous coating. In the whole wear process, fatigue wear is dominant, accompanied by oxidation wear. Furthermore, electrochemical test results indicate that the corrosion resistance of the WC-10Co-4Cr/Fe-based amorphous composite coatings is higher than that of the single iron-based amorphous coating. The polarization resistance of the 9 wt.% WC-10Co-4Cr/Fe-based amorphous composite coating is the highest, about 7975.94 +/- 375.42 Omega cm2, which is about 3 times that of the single iron-based amorphous coating (2547.84 +/- 256.05 Omega cm2).