کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1274797 | 1497550 | 2012 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Efficient dual layer interconnect coating for high temperature electrochemical devices Efficient dual layer interconnect coating for high temperature electrochemical devices](/preview/png/1274797.png)
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.
► Heterogeneous dual layer coatings Co3O4/La0.85Sr0.15MnO3−δ are successfully deposited on sample surfaces.
► The oxidation rate is reduced by 82–96% compared to uncoated steel.
► The corrosion kinetics is limited by outward chromium diffusion in the scale.
► Cation inter-diffusion and formation of new phases are observed at the coating-oxide scale interface.
Journal: International Journal of Hydrogen Energy - Volume 37, Issue 19, October 2012, Pages 14501–14510