Corrosion resistance of nanostructured WC-CoCr coating with Co-Cr alloy binder

摘要

The nanostructured WC-CoCr coating was fabricated by the high velocity oxy-fuel (HVOF) thermal spraying using a new type of WC-CoCr powder, in which the Co-Cr exists in a form of metallic compound. The Co-Cr alloy powder was prepared by the induction melting and subsequent mechanical milling. Detailed characterizations were carried out on the phase constitution and microstructure of the Co-Cr powder and the cermet coating, as well as the mechanical properties and corrosion resistance of the coating. The results show that the nanostructured WC-CoCr coating has greatly improved corrosion resistance as compared with the conventional WC-Co-Cr coating where Cr exists as single metal.