Experimental investigations on the chlorine-induced corrosion of HVOF thermal sprayed Stellite-6 and NiAl coatings with fluidised bed biomass/anthracite combustion systems

Chi, Hetian; Pans, Miguel A.; Bai, Mingwen; Sun, Chenggong; Hussain, Tanvir; Sun, Wei; Yao, Yuge; Lyu, Junfu; Liu, Hao

Abstract

Stellite-6 (Co-based) and NiAl coatings (Ni-based) were deposited via HVOF spraying onto 304 stainless steels and tested in a 20 kWth biomass fired bubbling fluidised bed (BFB) combustor for 20 hours and an industrial scale anthracite fired CFB boiler for 1630 hours. Stellite-6 showed excellent corrosion resistance in both fluidised bed combustion systems because of the formation of outermost Cr2O3 layer and the spinel CoCr2O4 beneath, whereas NiAl coatings' anti-corrosion performance was significantly depleted due to the chlorine attack, and the resultant formation of Al2O3 layer at the coating/substrate interface finally led to coating spallation in both systems.

Citation

Chi, H., Pans, M. A., Bai, M., Sun, C., Hussain, T., Sun, W., Yao, Y., Lyu, J., & Liu, H. (2021). Experimental investigations on the chlorine-induced corrosion of HVOF thermal sprayed Stellite-6 and NiAl coatings with fluidised bed biomass/anthracite combustion systems. Fuel, 288, Article 119607. https://doi.org/10.1016/j.fuel.2020.119607

• Journal Article Type: Article
• Acceptance Date: Oct 23, 2020
• Online Publication Date: Nov 19, 2020
• Publication Date: Mar 15, 2021
• Deposit Date: Nov 2, 2020
• Publicly Available Date: Nov 20, 2021
• Journal: Fuel
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 288
• Article Number: 119607
• DOI: https://doi.org/10.1016/j.fuel.2020.119607
• Keywords: Stellite-6, NiAl, High-velocity oxy fuel (HVOF), High-temperature corrosion, Bubbling fluidised bed (BFB), Circulating fluidised bed (CFB)
• Public URL: https://nottingham-repository.worktribe.com/output/5013026
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S001623612032603X
• Additional Information: This article is maintained by: Elsevier; Article Title: Experimental investigations on the chlorine-induced corrosion of HVOF thermal sprayed Stellite-6 and NiAl coatings with fluidised bed biomass/anthracite combustion systems; Journal Title: Fuel; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.fuel.2020.119607; Content Type: article; Copyright: © 2020 The Author(s). Published by Elsevier Ltd.