Study of Molten Salt Corrosion of High Velocity Oxy-Fuel Sprayed Cermet and Nickel-Based Coatings at 900 °C |
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Authors: | T S Sidhu S Prakash R D Agrawal |
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Affiliation: | (1) S.B.S. College of Engineering and Technology, Moga Road, Ferozepur, 152004, Punjab, India;(2) Metallurgical & Materials Engineering Department, Indian Institute of Technology Roorkee, Roorkee, 247 667, Uttranchal, India |
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Abstract: | Absract Samples of Cr3C2-NiCr cermet and NiCrBSi coatings formed by the high velocity oxy-fuel (HVOF) process on Superni 718 superalloy have been
corroded in the Na2SO4-V2O5 molten salt environment at 900 °C under cyclic conditions. The hot corrosion behavior of the coatings has been investigated
by means of thermogravimetric analysis, X-ray diffraction, scanning electron microscopy/energy dispersive spectroscopy, and
electron probe microanalyzer techniques. Efforts have been made to formulate the mode of corrosion attack. Both the coatings
protected the substrate superalloy Superni 718 completely. While protecting the superalloy, the Cr3C2-NiCr cermet coating partially oxidized along the splat boundaries up to the coating substrate interface, whereas only the
upper part of the coating, to about 100 μm from the surface, oxidized in the case of the NiCrBSi coating. The hot corrosion
resistance of both the coatings has been attributed to the formation of protective oxides of chromium/silicon at the surface
and at the splat boundaries of the coatings. |
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