COMPARISON OF HOT CORROSION PERFORMANCE OF BARE AND NiCoCrAlY-COATED AUSTENITIC STAINLESS STEEL AISI 347 IN AGGRESSIVE WASTE HEAT INCINERATOR ENVIRONMENT AT 650∘C

S. M. Muthu, R. V. Anant, D. Raghul, M. Ishwarya, N. Arivazhagan and M. Arivarasu
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S. M. Muthu: School of Mechanical Engineering, VIT, Vellore-632014, India
R. V. Anant: School of Mechanical Engineering, VIT, Vellore-632014, India
D. Raghul: School of Mechanical Engineering, VIT, Vellore-632014, India
M. Ishwarya: #x2020;Central Institution of Plastic Engineering and Technology, Chennai-600032, India
N. Arivazhagan: School of Mechanical Engineering, VIT, Vellore-632014, India
M. Arivarasu: #x2020;Central Institution of Plastic Engineering and Technology, Chennai-600032, India‡Centre for Innovative Manufacturing Research, VIT, Vellore-632014, India

Surface Review and Letters (SRL), 2020, vol. 27, issue 07, 1-15

Abstract: The hot corrosion behavior of bare and NiCoCrAlY-coated AISI 347 steel is investigated in Na2SO4-40%K2SO4-10%NaCl-10%KCl salt atmosphere at 650∘C for 10 cycles. Each cycle contains 5h heating and 30min cooling to ambient temperature. The NiCoCrAlY coating is employed on the austenitic stainless steel AISI 347 using high-velocity oxy-fuel (HVOF) coating method. Corrosion kinetics of the hot corroded steels are determined by thermo-gravimetric technique. The surface microstructures and compositions of the coating and corrosion products of the steels are characterized using a scanning electron microscope and energy dispersive spectroscopy. The phases of the coating are analyzed using X-ray diffraction method. Higher weight gain is observed on the uncoated specimen, and more oxide scale spallation is observed due to Fe2O3 oxide layer formation. In the coated specimen, there is no spallation of any oxide scales. The coating provides the resistance to the spallation of oxide scales. The EDS point analysis and elemental mapping analysis are performed on the cross-section to analyze the distribution of corrosion products with respect to depth.

Keywords: Thermal spray coating; hot corrosion; corrosion kinetics; internal corrosion attack (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1142/S0218625X19501683

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