Comparison of oxidation behaviours among three Fe-Cr based alloys for solid oxide fuel cell interconnect

Y. N. Cheng, C. L. Chu, S. Lee

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Two metallic alloys, containing comparable amounts of Cr, underwent oxidation in hot air simulating (the solid oxide fuel cell cathode atmosphere) for various periods. The results demonstrated that the oxidation kinetics of Crofer22 APU and equivalent ZMG232 followed the parabolic rate law and oxidation rates increased with temperature. Typical oxidation rates of Crofer22 APU and ZMG232 upon annealing treatment are approximately 0·21 orders of magnitude lower than that of ZMG232. An oxide scale electron probe microanalyser, a scanning electron microscope and X-ray diffractometer were adopted to verify the applicability of Fe-Cr based alloys in the solid oxide fuel cell interconnect component. Two alloys contain comparable amount of Cr, Mn and Fe, and their surface oxides as analysed are indicated to be Cr 2O 3 and (Mn,Fe)Cr 2O 4 spinel compound. In summary, Crofer22 APU had the best oxidation resistance of any of the alloys of interest.

Original languageEnglish
Pages (from-to)25-30
Number of pages6
JournalCorrosion Engineering Science and Technology
Volume47
Issue number1
DOIs
StatePublished - Feb 2012

Keywords

  • Interconnects
  • Oxide scales
  • SOFC
  • Solid oxide fuel cell

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