Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Corrosion and Surface Resistance of Ni-C Composite by Electrodeposition

전해도금에 의한 Ni-C 복합층의 내식성 및 표면 전기저항

  • Park, Je-Sik (School of Advanced Materials and System Eng., Kumoh National Institute of Technology) ;
  • Lee, Sung-Hyung (Jio Deco) ;
  • Jeong, Goo-Jin (Green Energy System Center, Kumoh National Institute of Technology) ;
  • Lee, Churl-Kyoung (School of Advanced Materials and System Eng., Kumoh National Institute of Technology)
  • 박제식 (금오공과대학교 신소재시스템공학부) ;
  • 이성형 (지오데코) ;
  • 정구진 (금오공과대학교 그린에너지시스템센터) ;
  • 이철경 (금오공과대학교 신소재시스템공학부)
  • Received : 2011.03.16
  • Accepted : 2011.04.19
  • Published : 2011.05.27
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Abstract

Simultaneous Ni and C codeposition by electrolysis was investigated with the aim of obtaining better corrosion resistivity and surface conductivity of a metallic bipolar plate for application in fuel cells and redox flow batteries. The carbon content in the Ni-C composite plate fell in a range of 9.2~26.2 at.% as the amount of carbon in the Ni Watt bath and the roughness of the composite were increased. The Ni-C composite with more than 21.6 at.% C content did not show uniformly dispersed carbon. It also displayed micro-sized defects such as cracks and crevices, which result in pitting or crevice corrosion. The corrosion resistance of the Ni-C composite in sulfuric acid is similar with that of pure Ni. Electrochemical test results such as passivation were not satisfactory; however, the Ni-C composite still displayed less than $10^{-4}$ $A/cm^2$ passivation current density. Passivation by an anodizing technique could yield better corrosion resistance in the Ni-C composite, approaching that of pure Ni plating. Surface resistivity of pure Ni after passivation was increased by about 8% compared to pure Ni. On the other hand, the surface resistivity of the Ni-C composite with 13 at.% C content was increased by only 1%. It can be confirmed that the metal plate electrodeposited Ni-C composite can be applied as a bipolar plate for fuel cells and redox flow batteries.

Keywords

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