| Hot Corrosion Behavior of HVOF Sprayed Coatings on ASTM SA213-T11 Steel | ||
| Dr. Buta Singh Sidhu1, Mr. Hazoor Singh Sidhu2 and S. Prakash3, 1Mechanical Engineering, GZS College of Engineering and Technology, Dabhwali Road, Bathinda, 151001, India, 2Mechanical Engineering, Yadvindra college of Engineering, Punjabi University Guru Kashi Campus, Talwandi Sabo, Bathinda, 151001, India, 3Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Near Civil Lines, Roorkee, 247 667, India Cr2C3-NiCr, NiCr, WC-Co and Stellite-6 metallic coatings were sprayed on ASTM SA213-T11 steel by HVOF process. LPG was used as the fuel gas. The bared and HVOF sprayed specimens were exposed to molten salt at 9000C under cyclic conditions to evaluate hot corrosion behaviour. The thermo-gravimetric technique was used to establish kinetics of corrosion. The corrosion products were analysed by XRD, SEM/EDAX and EPMA techniques. The coatings showed better resistance to hot corrosion and NiCr Coating was found to be most protective followed by Cr2C3-NiCr coating. The formation of Cr2O3, NiO, NiCr2O4, and CoO phases may have contributed to the development of hot corrosion resistance in the coatings. The bared steel suffered corrosion in the form of intense spalling and peeling of the scale, which may be due to the formation of unprotective Fe2O3 oxide scale. | ||