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

Bai, Mingwen and Reddy, Liam and Hussain, Tanvir (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 . pp. 147-157. ISSN 1879-0496

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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).

Item Type: Article
Keywords: Nickel Aluminide; Stainless Steel; HVOF; Biomass; Chlorine; Thermodynamic
Schools/Departments: University of Nottingham, UK > Faculty of Engineering
Identification Number: https://doi.org/10.1016/j.corsci.2018.02.047
Depositing User: Eprints, Support
Date Deposited: 27 Feb 2018 11:40
Last Modified: 20 Mar 2018 14:41
URI: http://eprints.nottingham.ac.uk/id/eprint/50053

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