Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Evaluation of Corrosion Resistance on Al-Cr Coated Stainless Steel Separator for MCFC at Anode Side

MCFC 양극측에서 Al-Cr피복 스테인레스강 분리판의 내식성평가

  • Lee, M.H. (Dep. of Metallurgical Eng., Kwangyang College) ;
  • Yoon, J.S. (Korea Research Institute of Rare Matals) ;
  • Bae, I.S. (Korea Research Institute of Rare Matals) ;
  • Yoon, D.J. (Dep. of Advanced Material Eng., Hanlyo Uni.) ;
  • Kim, B.I. (Material Science & Metallurgical Eng., Sunchon Nat. Uni.) ;
  • Park, H.H. (Korea Research Institute of Rare Matals)
  • Published : 2003.02.01
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Abstract

In order to evaluate the corrosion resistance at the anode side separator for molten carbonate fuel cell, STS316 and SACC-STS316 (chromium and aluminum were simultaneously deposited by diffusion into STS316 authentic stainless steel substrate by pack-cementation process) were applied as the separator material. In case of STS316, corrosion proceeded via three steps ; a formation step of corrosion product until stable corrosion product, a protection step against corrosion until breakaway occurs, a advance step of corrosion after breakaway. Especially, STS316 would be impossible to use the separator without suitable surface modification because of rapid corrosion rate after formation of corrosion product, occurs the severe problem on stability of cell during long-time operation. Whereas, SACC-STS316 was showed more effective corrosion resistance than the present separator, STS316 due to the intermetallic compound layer such as NiAl, Ni3Al formed on the surface of STS316 specimen. And it is anticipated that, in order to use SACC-STS316 alternative separator at the anode side, coating process, which can lead to dense coating layer, has to be developed, and by suitable pre-treatment before using it, very effective corrosion resistance will be achieved.

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References

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