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Effects of Cobalt Protective Coating Prepared by DC Electroplating on Ferritic Stainless Steel for SOFC Interconnect  

Hong, Jong-Eun (Fuel Cell Research Center, New and Renewable Energy Research Division, Korea Institute of Energy Researchq)
Lim, Tak-Hyung (Fuel Cell Research Center, New and Renewable Energy Research Division, Korea Institute of Energy Research)
Song, Rak-Hyun (Fuel Cell Research Center, New and Renewable Energy Research Division, Korea Institute of Energy Research)
Lee, Seung-Bok (Fuel Cell Research Center, New and Renewable Energy Research Division, Korea Institute of Energy Research)
Shin, Dong-Ryul (Fuel Cell Research Center, New and Renewable Energy Research Division, Korea Institute of Energy Research)
Yoo, Young-Sung (Strategic Technology Laboratory, Korea Electric Power Research Institute, Korea Electric Power Corporation)
Lee, Dok-Yol (Department of Materials Science and Engineering, Korea Univ.)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.20, no.2, 2009 , pp. 116-124 More about this Journal
Abstract
We investigated the influences of cobalt coating deposited by DC electroplating on the ferritic stainless steel, STS 430, as a protective layer on a metallic interconnect for SOFC applications. Cobalt coated STS 430 revealed a uniform and denser-packing oxide surface and a reduced growth rate of $Cr_2O_3$ scales after oxidation at $800^{\circ}C$in air. Cobalt coating layer was oxidized to $CoCo_2O_4$ and Co containing mixed oxide spinels such as $Co_2CrO_4$, $CoCr_2O_4$, and $CoCrFeO_4$. The area specific resistance value of Co coated sample was $0.020\;{\Omega}cm^2$ lower than that of uncoated at $800^{\circ}C$ in air during 500 h. After 1000 h oxidation, cobalt oxide coating layer suppressed chromium outward diffusion.
Keywords
Solid oxide fuel cell; Metallic interconnect; Protective layer; Cobalt coating; DC electroplating;
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