TY - JOUR ID - 148667 TI - 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 JO - International Journal of Engineering JA - IJE LA - en SN - 1025-2495 AU - Patil, V. G. AU - Somasundaram, B. AU - Kandaiah, S. AU - kumar, S. AD - School of Mechanical Engineering, REVA University Bengaluru, India AD - Department of Chemistry, School of Applied Sciences, REVA University Bengaluru, India Y1 - 2022 PY - 2022 VL - 35 IS - 7 SP - 1416 EP - 1427 KW - Hot Corrosion KW - High-velocity Oxy Fuel KW - Thermogravimetric analysis KW - Thermal spraying KW - oxide scale DO - 10.5829/ije.2022.35.07a.19 N2 - 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 the NiCrMoFeCoAl-30%SiO2 and NiCrMoFeCoAl-30%Cr2O3 composite coatings were deposited on bare ASTM SA213-T22 boiler steel for corrosion protection. High-temperature corrosion studies were conducted in a molten salt (Na2SO4-60%V2O5) environment at 700ºC under thermo-cyclic conditions. The as-sprayed composite coatings are characterized for microstructure and mechanical properties. The thermo-gravimetric method was utilized to understand the kinetics of corrosion. Characterization of the corrosion products was examined by using scanning electron microscope (SEM)/ Energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) techniques. The obtained results suggest both the composite coatings are favorable to corrosion resistance over the bare ASTM SA213-T22 boiler steel. The NiCrMoFeCoAl-30%Cr2O3 composite coating was concluded to present a superior corrosion resistance in the high-temperature corrosion environment because of the uniform distribution of the composite coating matrix and the development of protective protection Cr2O3 in the scale. The molten salt heat-treated chromium oxide containing coating shows good corrosion stability than the silica composite. This could be attributed to the high temperature assisted formation metal chromates, chromites and oxide layers. UR - https://www.ije.ir/article_148667.html L1 - https://www.ije.ir/article_148667_f067b9e0e17f7d84f637c775dbf425ea.pdf ER -