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

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

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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 h and an industrial scale anthracite fired CFB boiler for 1630 h. Stellite-6 showed excellent corrosion resistance in both fluidised bed combustion systems because of the formation of the 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.
Original languageEnglish
Article number119607
Number of pages13
JournalFuel
Volume288
Early online date19 Nov 2020
DOIs
Publication statusE-pub ahead of print - 19 Nov 2020
Externally publishedYes

Bibliographical note

2020 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)

Keywords

  • Bubbling fluidised bed (BFB)
  • Circulating fluidised bed (CFB)
  • High-temperature corrosion
  • High-velocity oxy fuel (HVOF)
  • NiAl
  • Stellite-6

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

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