Oxidation kinetics and electrical properties of oxide scales formed under exposure to air and Ar–H2-H2O atmospheres on the Crofer 22 H ferritic steel for high-temperature applications such as interconnects in solid oxide cell stacks

Tomasz Brylewski*, Sebastian Molin, Mirosław Stygar, Maciej Bik, Piotr Jeleń, Maciej Sitarz, Aleksander Gil, Ming Chen, Peter Vang Hendriksen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

A 100 h isothermal oxidation kinetics study for Crofer 22H was conducted in air and the Ar–H2-H2O gas mixture (p(H2)/p(H2O) = 94/6) in the range of 973–1123 K. The parabolic rate constant was independent of oxygen partial pressure in the range from 6.2 × 10−24 to 0.21 atm at 1023 and 1073 K, while at 973 and 1123 K it was higher in air than in Ar–H2-H2O. The scales consisted of Cr2O3 and manganese chromium spinel with an Mn:Cr ratio dependent on the oxidation conditions. Cross-scale resistance was evaluated with regards to the application of the steel in solid oxide fuel cells using a number of methods, including X-ray diffraction, scanning electron microscopy, confocal Raman imaging and area-specific resistance measurements.
Original languageEnglish
JournalInternational Journal of Hydrogen Energy
Volume94
Pages (from-to)209-222
Number of pages14
ISSN0360-3199
DOIs
Publication statusPublished - 2024

Keywords

  • Solid oxide fuel cells (SOFC)
  • Metallic interconnects
  • Oxidation kinetics
  • Microstructure
  • Confocal Raman imaging
  • Electrical conductivity

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