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| Abstract No.: |
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Scheduled at:
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Thursday, May 12, 2016, Room 3E 11:00 AM
Corrosion Protection
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| Title: |
Performance of HVOF sprayed Ni based coating on T22 steel in actual boiler environment
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| Authors: |
Niraj Bala* / Baba Banda Singh Bahadur Engineering College Fatehgarh Sahib., India
Niraj Bala Badwal / BBSBEC, India
Harpreet Singh/ IITR, Rupnagar, India
Satya Prakash/ IITR, Roorkee, India
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| Abstract: |
High Velocity Oxy Fuel (HVOF) spray process represents a significant part of overall thermal spray business. Ni based alloys have been used for thermal spraying for various applications. In the present work commercially available Ni-20Cr blended with TiC powder was successfully deposited on a boiler steel (SAE 213-T22). To evaluate the performance of the coating in actual conditions the bare as well as the coated steels were subjected to cyclic exposures, in the superheater zone of a coal fired boiler for 15 cycles. The weight change and thickness loss data were used to establish kinetics of the erosion-corrosion. X-ray diffraction, FE-SEM/EDS and X-ray mapping techniques were used to analyse the as-sprayed and eroded-corroded specimens. The better erosion-corrosion resistance of the coating in comparison to the uncoated steel may be attributed to the formation of oxides and spinels of nickel and chromium.
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