Journal article
Efficient dual layer interconnect coating for high temperature electrochemical devices
Effects of novel dual layer coatings Co3O4/La0.85Sr0.15MnO3−δ on high temperature oxidation behaviour of candidate steels for interconnects are studied at 1123 K in flowing simulated ambient air (air + 1% H2O) and oxygen. Four alloys are investigated: Crofer 22 APU, Crofer 22 H, E-Brite and AL 29-4C.
The reaction kinetics is followed by measuring the mass increase of the samples over time. The oxide scale microstructure and chemical composition are investigated by scanning electron microscopy/energy dispersive spectroscopy. The kinetic data follow the parabolic rate law. It is found that the oxidation reaction is limited by outward Cr3+ diffusion in the chromia scale.
The coating effectively reduces the oxidation rate. Reactions and cation inter-diffusion between the coating and the oxide scale are observed. Long term effects of these interactions are discussed and practical implications for interconnect electrochemical performance are suggested.
Language: | English |
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Year: | 2012 |
Pages: | 14501-14510 |
ISSN: | 18793487 and 03603199 |
Types: | Journal article |
DOI: | 10.1016/j.ijhydene.2012.07.038 |
ORCIDs: | Chen, Ming and Hendriksen, Peter Vang |