Hot Corrosion Studies of HVOF-Sprayed Cr₃C₂-NiCr Coating on 310S Stainless Steel in an Actual Environment of a Coal Fired Boiler

Abstract:

The present investigation is an attempt to evaluate the hot corrosion behaviour of high velocity-oxy fuel (HVOF) sprayed Cr3C2-25 % NiCr coating on 310S stainless steel in an actual industrial environment of a coal fired boiler. The cyclic studies were performed in the super heater zone of a coal-fired boiler where the temperature was around 700±100C. Experiments were carried out for 3 cycles each of 500 hours duration followed by 1 hour cooling in air till room temperature. X-ray diffraction (XRD) analysis and field emission scanning electron microscope (FESEM, FEI, Quanta 200F Company) with EDAX Genesis software attachment were used to analyse the oxidation-erosion products. The Cr3C2-25wt% NiCr coated specimen showed good adherence to the 310S SS substrate with negligible microspalling of the scales. The Cr3C2-25wt % NiCr coating deposited on 310S stainless steel imparted better hot corrosion resistance than the uncoated one in the given environment.

• Periodical: Advanced Materials Research (Volume 585)
• Pages: 483-487
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.585.483
• Online since: November 2012
• Authors: V.N. Shukla, R. Jayaganthan, V.K. Tewari
• Keywords: Cr₃C₂–NiCr, Hot Corrosion, HVOF

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