In this study, the effect of chromium oxide added to Stellite 6 powder has been investigated. To this purpose chromium oxide powders with 10, 20 and 30 wt% were well mixed with Stellite 6 and coated on Inconel 617 substrates using plasma spraying technique. The X-ray diffraction analysis was used to detect the phases formed in powders and coatings. Microstructure, porosity and morphology of powders and coatings were studied by optical microscopy and scanning electron microscopy. The hardness of coatings was investigated by microhardness test. In order to characterization of wear resistance of coatings, the pin on disk test at room and 600 C temperature with 40N load in 1000m distance was used. Moreover, cyclic hot corrosion studies were conducted on samples in molten salt environment at 900?C for 50 hours. The results of microhardness tests and phase analysis showed that the hardness of coatings was improved with increase in the content of chromium oxide related to the increasing the amount of hard oxide particles. The coating with 30 wt% chromium oxide indicated the highest wear resistance at room and high temperatures. The investigation of wear traces in contribution with scanning electron microscopy showed that an oxide layer was formed on worn surface playing a key role in reduction of friction coefficient and improvement of wear resistance. This oxide layer was formed better at high temperature. In general, the wear mechanism was in delamination form. The results of hot corrosion tests exhibited that the coating with 30 wt% chromium oxide had the highest corrosion resistance at high temperature related to the increase in chromium oxide content. Furthermore, the increment of weight loss of aforementioned coating was parabolic. Keywords: Stellite 6, Chromium oxide, Plasma Spray, Wear, Hot corrosion.
