Effective yttrium based coating for steel interconnects of solid oxide cells: Corrosion evaluation in steam-hydrogen atmosphere

S. Molin*, Å.H. Persson, T. L. Skafte, A. L. Smitshuysen, S.H. Jensen, K.B. Andersen, H. Xu, M. Chen, P. V. Hendriksen

*Corresponding author for this work

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Abstract

This work describes manufacture, analysis and test of a new well conducting corrosion-protection coating that can be applied on steel types with high chromium content. Electrolytic deposition of yttrium salts is used to form thin (<100 nm) coatings on both flat steel sheets (material: Crofer 22 APU) and its properties are proven on woven wire-meshes (materials from two different sources: SUS316 and SUS316L). The oxide scale on the coated Crofer 22 APU sheet remains intact after 2000 h operation at 750 °C in H2 with 90% H2O. The corrosion rate at 750 °C of the coated Crofer 22 APU sheets is compared with that of uncoated samples and of samples with a commercial magneton sputtered CGO coating revealing that the coatings reduce the parabolic rate constant characteristic of the corrosion by a factor of 10 and 20 for the CGO and the Y, respectively.

The coated meshes also exhibit high corrosion resistance and long-term-stable low electrical resistance at 650 °C, both in 90% H2O in H2, and in air. In addition to the experimental work, Y–Cr–O2 phase diagrams are constructed illustrating the high stability of the YCrO3 phase (that forms during corrosion) over a wide temperature and pO2 range.

Original languageEnglish
Article number226814
JournalJournal of Power Sources
Volume440
Number of pages11
ISSN0378-7753
DOIs
Publication statusPublished - 2019

Keywords

  • Crofer 22 APU
  • SOEC
  • SOFC
  • High temperature corrosion
  • Protective coatings
  • Electrodeposition

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