Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Effects of Cobalt Protective Coating Prepared by DC Electroplating on Ferritic Stainless Steel for SOFC Interconnect

직류 전기도금을 이용한 고체산화물 연료전지 금속연결재용 페라이트계 스테인리스 스틸의 코발트 보호막 코팅 효과

  • 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.)
  • 홍종은 (한국에너지기술연구원 신재생에너지연구부) ;
  • 임탁형 (한국에너지기술연구원 신재생에너지연구부) ;
  • 송락현 (한국에너지기술연구원 신재생에너지연구부) ;
  • 이승복 (한국에너지기술연구원 신재생에너지연구부) ;
  • 신동열 (한국에너지기술연구원 신재생에너지연구부) ;
  • 유영성 (한국전력연구원 전략기술연구소) ;
  • 이덕열 (고려대학교 신소재공학과)
  • Published : 2009.04.30
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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

References

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