Corrosion Science and Technology

  • 제3권4호
  • /
  • Pages.161-165
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  • 2004
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  • 1598-6462(pISSN)
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  • 2288-6524(eISSN)
한국부식방식학회 (The Corrosion Science Society of Korea)
권호 표지

Lifetime Evaluation of AI-Fe Coating in Wet-seal Environment of MCFC

  • Jun, JaeHo (New Materials &Components Research Center, Research Institute of Industrial Science and Technology) ;
  • Jun, JoongHwan (New Materials &Components Research Center, Research Institute of Industrial Science and Technology) ;
  • Kim, KyooYoung (Department of Materials Science & Engineering, Pohang University of Science and Technology)
  • 발행 : 2004.08.01
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초록

Aluminum source in an Al-Fe coating reacts with molten carbonate and develops a protective $LiAlO_2$ layer on the coating surface during operation of molten carbonate fuel cells (MCFC). However, if aluminum content in an Al-Fe coating decreases to a critical level for some reasons during MCFC operation, a stable and continuous $LiAlO_2$ protective layer can no longer be maintained. The aluminum content in an Al-Fe coating can be depleted by two different processes; one is by corrosion reaction at the surface between the aluminum source in the coating and molten carbonate, and the other is inward-diffusion of aluminum atoms within the coating into a substrate. In these two respects, therefore, the decreasing rate of aluminum concentration in an Al-Fe coating was measured, and then the influences of these two aspects on the lifetime of Al-Fe coating were investigated, respectively.

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