Wear and corrosion performance of WC-10Co4Cr coatings deposited by different HVOF and HVAF spraying processes

This study compares three types of WC-10Co4Cr coatings deposited with high-velocity oxygen fuel (HVOF) and high-velocity air fuel (HVAF) spraying processes. The experimental results indicated that the decarburisation of the WC in the WC-10Co4Cr coating was dramatically influenced by the spraying equipment, and the non-WC phase content in the as-sprayed coatings greatly influenced their performances. The HVAF-sprayed WC-10Co-4Cr coating revealed the lowest degree of decarburisation, achieving the best properties in terms of hardness, fracture toughness, abrasive and sliding wear as well as electrochemical corrosion resistance when compared to the two HVOF-sprayed WC-10Co-4Cr coatings.

► The corrosion resistance of HVAF sprayed WC-10Co4Cr coating was firstly examined.
► HVOF deposition process of WC-10Co4Cr coating strongly affects their performance.
► Phase composition of WC-10Co4Cr coating strongly influences its corrosion behaviour.
► Phase composition of WC-10Co4Cr coating strongly influences its wear behaviour.