Experimental Investigation on the Effect of Coating Al2O3+70% NiCrBSi Cermets on Ti-31 Superalloy to Combat Hot Corrosion

The superalloys are generally used for high-temperature applications, and since they operate in an aggressive environment, it is required to protect them with appropriate coating enhance the life of superalloy material. In present study, Ti-31 coated cermets Al2O3+NiCrBSi by high-velocity oxy fuel (HVOF) spray technique, hot corrosion tests were performed on both uncoated samples, presence Na2SO4+60% V2O5 molten salt at a temperature 700°C, corroded samples characterized using SEM/EDS XRD techniques. From thermogravimetric studies, observed that total weight gain per unit area very high compared Al2O3+NiCrBSi-coated parabolic rate constant indicates decreased when substrate coated. current study’s findings clearly show deposition effective protecting from corrosion.