Under the background of wide application of low nitrogen and oxygen combustion technology and deep peaking technology

the high temperature corrosion failure of water wall tubes is more serious in service process. The high-temperature corrosion behavior characteristics of the boiler water wall tube and high-speed arc spraying PS45 coated tube from a power plant were comparatively investigated. Moreover

the corrosion surface morphology

corrosion products compositions and corrosion cross section characteristics were systematically analyzed by means of SEM

EDS and XRD. The results show that

the high-speed arc spraying PS45 coating can effectively improve the high temperature corrosion resistance of water wall tubes

and the thickness of the surface corrosion layer is small. In the process of high temperature service

the PS45 coating shows better corrosion resistance due to its high content of Cr and Ni

and the thickness of the surface corrosion products layer is thin.However

the microscopic pores between the coating particles will lead to intrusion of high-temperature corrosion reactions

and even cause direct corrosion of the water wall tubes at the coating/substrate interface.