Effect of Electrical Current on Solid Oxide Fuel Cells Metallic Interconnect Oxidation in Syngas

Volume 7 Issue 1, Pages 41 – 48

Yihong Li, Yinglu Jiang, Junwei Wu, Richard Pineault, Randall Gemmenn,
Xingbo Liu
Published Online: Aug 15 2009 1:46AM

DOI: 10.1111/j.1744-7402.2009.02430.x

ABSTRACT
Electrical current flow is one of the important factors influencing
high-temperature oxidation of SOFC interconnects. To understand the
effect of electric current on corrosion behavior, Crofer 22 APU and
Haynes 230//SS430 clad coupons were exposed to a simulated coal syngas
at 800°C with a current density of 0.5 A/cm²,
for 500 h. It was found that the scale formed on the positive side was
thicker than that formed on the negative side. In particular, for Crofer
22 APU, the morphology of the scale formed on the positive side was
whisker-like while the scale formed on the negative side was
predominantly cubic-shaped crystals. For Haynes 230//SS430 clad sample,
some grain-shaped crystals appeared on SS 430 (negative) side due to the
breakaway oxidation.

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