Erosion-corrosion wastage at elevated temperature of arc spraying composite coatings on boiler tube of coal thermal power station

To solve the problem of erosion-corrosion wastage at elevated temperature on boiler tube of coal thermal power station,several cored wires for Fe₃Al,Fe₃Al/WC,FeCrAl/WC and FeCrNi/WC inter metallic coatings by high victory arc spraying were developed.The erosion-corrosion wastage of coatings at elevated temperature was researched with different impact angles and temperatures.The results indicate that impact angle and temperature greatly affected FeCrAl/WC coating and Fe₃Al/WC coating in erosion-corrosion wastage.As compared with water wall tube material (G20 steel) of power station,the erosion-corrosion resistances at elevated temperature of Fe₃Al,Fe₃Al/WC and FeCrAl/WC coatings were higher.Especially,the FeCrAl/WC coating presents the best erosion-corrosion resistance under every impactive angle.The problem of erosion-corrosion under erosive condition of high temperature gas ash mixture in boiler tube of coal thermal power station may be solved with FeCrAl/WC coating.