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

JOURNAL OF POWER SOURCES

卷:440

Article

Molin, S.^1,2  Persson, A. H.¹  Skafte, T. L.¹  Smitshuysen, A. L.¹  Jensen, S. H.¹  Andersen, K. B.¹  Xu, H.¹  Chen, M.¹  Hendriksen, P. V.¹ 

[1] Tech Univ Denmark, Dept Energy Convers & Storage, Frederiksborgvej 399, DK-4000 Roskilde, Denmark

[2] Gdansk Univ Technol, Fac Elect Telecommun & Informat, G Narutowicza 11-12, PL-80233 Gdansk, Poland

关键词: Crofer 22 APU;    SOEC;    SOFC;    High temperature corrosion;    Protective coatings;    Electrodeposition;   

DOI  :  10.1016/j.jpowsour.2019.226814

来源: Elsevier

【 摘 要 】

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 degrees C in H-2 with 90% H2O. The corrosion rate at 750 degrees 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 degrees C, both in 90% H2O in H-2, and in air. In addition to the experimental work, Y-Cr-O-2 phase diagrams are constructed illustrating the high stability of the YCrO3 phase (that forms during corrosion) over a wide temperature and pO(2) range.

【 授权许可】

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