Friction Behavior of WC-12Co、WC-10Co4Cr and Cr3C2-25NiCr coatings under different media*

Abstract:

In order to study the friction behavior of hard surface coatings under different media, the coatings were prepared by HVOF with WC-12Co, WC-10Co4Cr and Cr3C2-25NiCr materials as raw materials. The properties of the coatings were analyzed by micro-hardness tester, wear tester, scanning electron microscope and so on. The results showed that the porosity of the coating was closely related to the content of the binder phase. In air, WC-10Co4Cr had the highest hardness and the lowest friction coefficient, while Cr3C2-25NiCr had the lowest hardness and the highest friction coefficient. In the environment of 1mol/L HCl, the best corrosion resistance of NiCr binder made the friction coefficient of Cr3C2-25NiCr coating stable, and the poor corrosion resistance of pure Co and CoCr made the friction coefficient of WC-10Co4Cr and WC-12Co coatings with high and low fluctuations. In the friction process under 1mol/L NaOH environment, the corrosion of hard phase could reduce the hardness and increase the friction coefficient.