High Temperature Corrosion Behavior of High Velocity Oxy Fuel Sprayed NiCrMoFeCoAl-30%SiO2 and NiCrMoFeCoAl-30%Cr2O3 Composite Coatings on ASTM SA213-T22 Steel in a Coal-fired Boiler Environment

High-velocity oxy fuel (HVOF) sprayed coatings can improve the corrosion resistance of bare ASTM SA213-T22 boiler steel. In this report, we have investigated NiCrMoFeCoAl-30%SiO2 and NiCrMoFeCoAl-30%Cr2O3 composite were deposited on steel for protection. High-temperature studies conducted in a molten salt (Na2SO4-60%V2O5) environment at 700ºC under thermo-cyclic conditions. The as-sprayed are characterized microstructure mechanical properties. thermo-gravimetric method was utilized to understand kinetics corrosion. Characterization products examined by using scanning electron microscope (SEM)/ Energy dispersive spectroscopy (EDS) X-ray diffraction (XRD) techniques. obtained results suggest both favorable over coating concluded present superior high-temperature because uniform distribution matrix development protective protection Cr2O3 scale. heat-treated chromium oxide containing shows good stability than silica composite. This could be attributed high temperature assisted formation metal chromates, chromites layers.