Abstract
WC thermally sprayed coating is widely used in industry for its high wear resistance properties. Unfortunately, WC-Co coatings are plagued by low corrosion resistance in aqueous solutions. In this study, first, two kinds of coatings (WC-12Co & WC-10Co-4Cr) were deposited on SS400 steel by high-velocity flame spraying. Second, fracture behavior was investigated through corrosion fatigue testing in a Na_2SO_4 aqueous solution (R=0∫=14Hz). Improvement of corrosion fatigue was also examined. COrrosion fatigue fractures were found to associated with corrosion pits formed at the interface between the coating and the substrate. Thermal spraying of Al-Zn as an undercoat between the WC thermally sprayed coatings and the substrate appears to be an efective method for improving corrosion fatigue strength.
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