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

Mingwen Bai, Liam Reddy , Tanvir Hussain

Research output: Contribution to journalArticle

17 Citations (Scopus)
7 Downloads (Pure)

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 languageEnglish
Pages (from-to)147-157
Number of pages11
JournalCorrosion Science
Volume135
Early online date21 Feb 2018
DOIs
Publication statusPublished - 1 May 2018
Externally publishedYes

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

Fingerprint Dive into the research topics of 'Experimental and thermodynamic investigations on the chlorine-induced corrosion of HVOF thermal sprayed NiAl coatings and 304 stainless steels at 700 °C'. Together they form a unique fingerprint.

  • Cite this