Abstract
Thermal-spray WC cermet coatings corrosion by high velocity oxygen-fuel spraying was studied using potentiodynamic and potentiostatic polarization in an aerated sodium sulfate solution. The cermet coating was the WC-Co, WC-Co-Cr, and WC-Cr-Ni matrials on the carbon steel substrate. The anodic polarization curves of WC cermet coating were passive, transpassive, and reqired oxygen evolution. Cathodic polarization curves show a limited diffusion current of oxygen and hydrogen evolution. Coatings tended to decrease passive current density with increasing pH of solution. The presence of Cr in the matrix alloy decreases passive current and controll the dissolution of WC and Co. The Ni-Cr alloy matrix without Co showed no dissolved WC.
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