Behavior of Cold Spray Coating in Real Incineration Environment

In the present research work, efforts are made to study the performance of the uncoated and cold spray NiCrAlY-coated superalloy in medical waste incinerator environment. The study was conducted in the secondary chamber of medical waste incinerator. The high-temperature performance of uncoated and coated superalloy was assessed by measuring the penetration of corrosion species and drop off scale thickness. The development of Al2O3 in the top oxide scale and dense structure of the coating is found to be responsible for the better performance of coated superalloy against erosion–corrosion. Cold spray NiCrAlY-coated heat exchanger tubes were estimated to have degradation rate about 35 mils/year.