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| Abstract No.: |
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Scheduled at:
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Friday, May 23, 2014, Hall H1 11:40 AM
Corrosion Protection
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| Title: |
Enhancing high temperature corrosion resistance of SA213-T91 steel by HVOF-sprayed nanostructured Ni-20Cr coating
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| Authors: |
Manoj Kumar* / CGC College of Engineering Landran, India
H. Singh / IIT Ropar, Nangal Road, Rupnagar-140001, Punjab, India
Narinder Singh/ IIT Ropar, Nangal Road, Rupnagar-140001, Punjab, India
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| Abstract: |
Ni-20Cr nanocrystalline powder was synthesized by the investigators using ball milling route. The synthesized powder was deposited on T91 boiler steel by high velocity oxy-fuel (HVOF) spraying process under the set parameters. The uncoated and coated specimens were exposed to superheater zone of a coal fired boiler at 750°C for 15 cycles under cyclic conditions, to ascertain the erosion-corrosion (E-C) behavior. Each cycle comprised of 100 hour of heating in the boiler followed by 1 hour cooling. The kinetics of E-C was established using weight change and thickness loss of the samples. The corrosion products were studied using different characterization techniques, which included SEM/EDS, XRD analysis. The coating was found to be successful to reduce the corrosion rate of the steel by 85%.
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