Wear Resistant coating via HVOF spraying of Cr3C2\NiCr

Hard chrome plating, via electro-deposition has been very popular for the past few decades. It was recently found that hexavalent chrome, a carcinogenic by-product of the chrome plating, is contained into the waste, which requires special treatment. To combat this, new processes of coatings deposition must be implemented. High Velocity Oxy-Fuel spraying is used for dense coatings deposition with limited porosity. Cr₃C₂\NiCr was tested as an alternative solution to replace hard chrome plating, combining high wear resistance and lower coating weight compared to other carbide based coatings. Ball on disk adhesive wear and rubber wheel abrasive wear testing were employed to evaluate the wear resistance of Cr₃C₂\NiCr coatings under different modes of wear regimes. The wear behavior of the coatings was correlated to the spraying parameters used for coating deposition. Under certain parameters combinations the  Cr₃C₂\NiCr  coatings presented superior wear performance compared  to HVOF sprayed WC-CoCr and  hard chrome coatings.