: In this study, WC-Co and stellite 6 coatings were produced by HP/HVOF process and characterized. Also, corrosion behavior of the coatings was investigated after 14 days of immersion in molten zinc pool. Different chemical compositions WC-Co (WC-12Co، WC-17Co and WC-10Co-4Cr) and stellite 6 powder were used as feed powders. Evaluation of microstructure and properties of obtained coatings was done by X-ray diffraction (XRD) and scanning electron microscope (SEM). XRD’s result of WC-Co coatings revealed presence of negligible amounts of W 2 C and Co 6 W 6 C phases, which indicates very low decarborizing of WC phase. In the case of stellite 6, presence of Cr 7 C 3 and Cr 23 C 6 carbide phases and CoC x and Co 6 W 6 C cobalt riched phases was observed, which results in high hardness coating and low wear rate. Microhardness measurments showed that WC-10Co-4Cr coating has the highest hardness among WC coatings of 1280 vickers. While hardness of stellite 6 was 640 vickers. The ball-on-disk test with 1000 m sliding distance at 450?C was used to hot wear resistance assessment of coatings. The results indicated that the WC-10Co-4Cr coating exhibits maximum wear resistance. The main wear mechanisms was adhesive for WC coatings and adhesive-abrasive for stellite 6 coating. SEM/EDS was used in order to investigate the corrosion behaviour of the coatings. At cross section of WC-12Co and WC-10Co-4Cr coatings some cracks were observed where diffused element in these cracks was aluminium. No crack was observed in stellite 6 coating, due to high percent of cobalt in this coating. Aluminium diffusion in this coating was higher than zinc diffusion and resulted in a continous layer at the coating-substrate and interface. Keywords: WC-Co cermet, stellite 6, HP/HVOF process, molten zinc, hot wear
