Hot-corrosion behavior of Cr<sub>2</sub>O<sub>3</sub>-CNT-coated ASTM-SA213-T22 steel in a molten salt environment at 700℃

Khushdeep Goyal; Hazoor Singh; Rakesh Bhatia

doi:10.1007/s12613-019-1742-8

Volume 26 Issue 3

Mar. 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(3): 337-344

Khushdeep Goyal, Hazoor Singh, and Rakesh Bhatia, Hot-corrosion behavior of Cr₂O₃-CNT-coated ASTM-SA213-T22 steel in a molten salt environment at 700℃, Int. J. Miner. Metall. Mater., 26(2019), No. 3, pp. 337-344. https://doi.org/10.1007/s12613-019-1742-8

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Khushdeep Goyal, Hazoor Singh, and Rakesh Bhatia, Hot-corrosion behavior of Cr2O3-CNT-coated ASTM-SA213-T22 steel in a molten salt environment at 700℃, Int. J. Miner. Metall. Mater., 26(2019), No. 3, pp. 337-344. https://doi.org/10.1007/s12613-019-1742-8

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Research Article

Hot-corrosion behavior of Cr₂O₃-CNT-coated ASTM-SA213-T22 steel in a molten salt environment at 700℃

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Corresponding author:
Khushdeep Goyal E-mail: khushgoyal@yahoo.com
Received: 6 June 2018; Revised: 21 August 2018; Accepted: 29 August 2018

Abstract

Abstract

The present work investigates the hot-corrosion behavior of carbon nanotube (CNT)-reinforced chromium oxide coatings on boiler steel in a molten salt (Na₂SO₄-60wt%V₂O₅) environment at 700℃ under cyclic conditions. The coatings were deposited via the high-velocity oxygen fuel process. The uncoated and coated steel samples were subjected to hot corrosion in a silicon tube furnace at 700℃ for 50 cycles. The kinetics of the corrosion behavior was analyzed through mass-gain measurements after each cycle. The corrosion products were analyzed by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray analysis techniques. The results revealed that uncoated steel suffered spallation of scale because of the formation of nonprotective Fe₂O₃ scale. The coated steel samples exhibited lower mass gains with better adhesiveness of oxide scale with the steel alloy until the end of exposure. The CNT-reinforced coatings were concluded to provide better corrosion resistance in the hot-corrosion environment because of the uniform dispersion of CNTs in the coating matrix and the formation of protective chromium oxides in the scale.
- carbon nanotubes;
- corrosion;
- thermal spray;
- porosity;
- composite;
- boiler steel

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