Performance of Detonation Gun-Sprayed Ni-20Cr Coating on ASTM A213 TP347H Steel in a Boiler Environment |
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Authors: | G Kaushal H Singh S Prakash |
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Affiliation: | 1. RIMT-Institute of Engineering & Technology Mandi Gobindgarh, Punjab, India 2. Indian Institute of Technology Ropar, Rupnagar, Punjab, India 3. Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, India
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Abstract: | Detonation gun-sprayed coatings are known for their high density, high bond strength, moderate substrate heating, superior surface finish, better wear/corrosion resistance, and low cost. In this study, detonation gun-spraying technique was used to deposit Ni-20Cr coating on a commonly used boiler steel ASTM A213 TP347H. The specimens with and without coating were subjected to cyclic oxidation testing at an elevated temperature of 700 °C in actual boiler environment to ascertain the usefulness of the coating. The mass change technique was used to establish the kinetics of erosion-corrosion. XRD and SEM/EDS techniques were used to analyze the exposed samples. The uncoated sample suffered from erosion, and a significant mass loss was recorded. It was observed that overall mass loss was reduced by 83% and thickness loss by 53% after the application of the coating. The detonation gun-sprayed Ni-20 Cr coating was found to be suitable to impart erosion resistance to the given steel in the actual boiler environment. |
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