Abstract
Alumina-forming β-NiAl coatings were deposited by high velocity oxy-fuel (HVOF) thermal spraying 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 h. 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).
Original language | English |
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Pages (from-to) | 147-157 |
Number of pages | 11 |
Journal | Corrosion Science |
Volume | 135 |
Early online date | 21 Feb 2018 |
DOIs | |
Publication status | Published - 1 May 2018 |
Externally published | Yes |
Bibliographical note
© 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/).Keywords
- Nickel aluminide
- Stainless steel
- HVOF
- Biomass
- Chlorine
- Thermodynamic
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Mingwen Bai
- Centre for Manufacturing and Materials - Assistant Professor (Research)
Person: Teaching and Research