Hydro-abrasive erosion behaviors of HVOF sprayed carbide-based cermet coatings in simulated seawater slurries

Abstract

This paper aims at the hydro-abrasive erosion (HAE) behaviors in simulated seawater slurries under different flow velocities (FVs) and sand concentrations (SCs) of high-velocity oxygen-fuel (HVOF) sprayed carbide-based cermet coatings. The WC-Ni coating possessed worse anticorrosion property and superior HAE resistance regardless of FV and SC, and its HAE resistance was less affected by FV (80.6%) as well as SC (59.4%) in contrast with the Cr3C2-NiCr coating (141.4% and 103.8%) by taking the increment of VLR as the evaluation criteria. Higher FV and SC both contributed to the HAE degradation of the coatings, while FV had a greater effect on their HAE resistances than SC. The HAE failure mechanisms of both coatings under different FVs and SCs were also explained.