The effect of aluminium addition on the high-temperature oxidation behaviour and Cr evaporation of aluminised and alumina-forming alloys for SOFC cathode air pre-heaters

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Abstract

The corrosion behaviour and Cr retention ability of SS309, aluminised SS309, and AluChrom 318 have been investigated at 850 °C in air with 3% H2O. The SS309 samples failed the specifications for application as cathode air preheater (CAPH) material due to a high Cr evaporation rate and massive scale spallation. The surface aluminisation dramatically decreased the Cr evaporation rate of SS309, but not in the long-term due to breakaway oxidation induced alumina scale spallation. The AluChrom 318 formed a γ-Al2O3/α-Al2O3 layer scale and demonstrated the highest Cr retention ability and oxidation resistance among the tested alloy samples.
Original languageEnglish
Article number108612
Number of pages11
JournalCorrosion Science
Volume169
Early online date20 Mar 2020
DOIs
Publication statusPublished - Jun 2020

Keywords

  • SOFC
  • Stainless Steel
  • Heat exchanger
  • Heat Treatment
  • Denuder technique
  • FeCrAl alloy
  • High temperature oxidation
  • Cr evaporation

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Metals and Alloys
  • Energy Engineering and Power Technology
  • Chemical Engineering(all)
  • Chemistry(all)
  • Materials Science(all)

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