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| Abstract No.: |
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| Title: |
Corrosion behavior of HVOF-sprayed Ni-20Cr coating in a molten salt environment at 900°C
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| Authors: |
Gagandeep Kaushal* / Punjab Technical University, India
Harpreet Singh / Indian Institute of Technology Ropar, INDIA
Satya Prakash/ Indian Institute of Technology Roorkee, INDIA
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| Abstract: |
HVOF thermal spray technique was used to deposit Ni-20Cr coating on a ASTM-SA213-T22 boiler steel. The corrosion behaviour was investigated for the uncoated and HVOF sprayed Ni-20Cr coated boiler steel in a molten salt environment (Na2SO4-60%V2O5) at 900°C for 50 cycles. Each cycle consisted of 1 hour heating in the silicon carbide tube furnace followed by 20 min cooling in air. Mass change technique was used to approximate the kinetics of high temperature corrosion. The uncoated sample suffered intensive spallation along with a significant mass gain as compared to the coated sample. The exposed specimens were characterized by X-ray diffraction [XRD] and scanning electron microscopy/energy dispersive spectroscopy [SEM/EDS]. It was observed that HVOF-sprayed Ni-20Cr coating was suitable to provide high temperature corrosion resistance to the given steel in the said environment.
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