Experimental and thermodynamic investigations on the chlorine-induced corrosion of HVOF thermal sprayed NiAl coatings and 304 stainless steels at 700 °C

Bai, Mingwen; Reddy, Liam; Hussain, Tanvir

Abstract

Alumina-forming β-NiAl coatings were deposited by high Velocity Oxy-fuel (HVOF) thermal spray onto 304 stainless steels for protection against chlorine induced corrosion in a biomass-fired boiler. The corrosion test was conducted in a synthetic gas containing 500 ppm HCl with 10 wt% KCl ash deposit at 700 °C for 250 hours. Severe corrosion was observed with the fast growing alumina at the coating/substrate interface initiating from sample edges. Possible corrosion mechanism was proposed: as supplied by HCl/KCl, the formation of volatile chlorine/chloride acted as a catalyst and promoted the growth of alumina at relatively lower application temperatures (<900 °C).

Citation

Bai, M., Reddy, L., & Hussain, T. (2018). Experimental and thermodynamic investigations on the chlorine-induced corrosion of HVOF thermal sprayed NiAl coatings and 304 stainless steels at 700 °C. Corrosion Science, 135, https://doi.org/10.1016/j.corsci.2018.02.047

• Journal Article Type: Article
• Acceptance Date: Feb 20, 2018
• Online Publication Date: Feb 21, 2018
• Publication Date: May 1, 2018
• Deposit Date: Feb 27, 2018
• Publicly Available Date: Feb 27, 2018
• Journal: Corrosion Science
• Print ISSN: 0010-938X
• Electronic ISSN: 1879-0496
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 135
• DOI: https://doi.org/10.1016/j.corsci.2018.02.047
• Keywords: Nickel Aluminide; Stainless Steel; HVOF; Biomass; Chlorine; Thermodynamic
• Public URL: https://nottingham-repository.worktribe.com/output/930542
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0010938X1731644X
• Contract Date: Feb 27, 2018