Corrosion and Wear Performance of Stellite Alloy Hardfacing Prepared via Laser Cladding

Stellite 6 alloy hardfacing has been popularly applied on the seat face of control valves where both wear and corrosion in various corrosive media are involved. In this research, Stellite 6 alloy hardfacing is prepared via laser cladding and the wear performance and corrosion behavior in morpholine, 3.5 wt % NaCl, and Green Death solution, of this hardfacing are investigated using a pin-on-disc tribometer and a three-electrode cell, respectively. The worn and corroded surfaces are analyzed using SEM/EDS. For comparison, cast Stellite 6 is also studied in parallel. The experimental results show that cast Stellite 6 has better wear resistance than laser clad Stellite 6 but better corrosion resistance in the corrosive media due to better retention of the oxide film on the specimen surface.