Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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The Protection Potential Decision by Electrochemical Experiment of Al-Mg-Si Alloy for Ship in Seawater

해수용액에서 선박용 Al-Mg-Si 합금의 전기화학적 실험에 의한 방식전위 결정

  • Jeong, S.O. (Division of Marine Engineering, Mokpo Maritime University) ;
  • Park, J.C. (Division of Marine Engineering, Mokpo Maritime University) ;
  • Han, M.S. (Division of Marine Engineering, Mokpo Maritime University) ;
  • Kim, S.J. (Division of Marine Engineering, Mokpo Maritime University)
  • 정상옥 (목포해양대학교 기관시스템공학부) ;
  • 박재철 (목포해양대학교 기관시스템공학부) ;
  • 한민수 (목포해양대학교 기관시스템공학부) ;
  • 김성종 (목포해양대학교 기관시스템공학부)
  • Received : 2010.02.06
  • Accepted : 2010.02.24
  • Published : 2010.02.01
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Abstract

The many vessels are built with FRP(Fiber-Reinforced Plastic) material for small boats and medium vessels. However, FRP is impossible to be used for recyclable material owing to environmental problems and causes large proportion of collision accidents because radar reflection wave is so weak that large vessels could not detect FRP ships during the sailing. Hence, Al alloy comes into the spotlight to solve these kinds of problems as a new-material for next generation instead of FRP. Al alloy ships are getting widely introduced for fish and leisure boats to save fuel consumption due to lightweight. In this study, it was selected 6061-T6 Al alloy which are mainly used for Al-ships and carried out various electrochemical experiment such as potential, anodic/cathodic polarization, Tafel analysis, potentiostatic experiment and surface morphologies observation after potentiostatic experiment for 1200 sec by using the SEM equipment to evaluate optimum corrosion protection potential in sea water. It is concluded that the optimum corrosion protection potential range is -1.4 V ~ -0.7 V(Ag/AgCl) for 6061-T6 Al alloy, in the case of application of ICCP(Impressed current cathodic protection), which was shown the lowest current density at the electrochemical experiment and good specimen surface morphologies after potentiostatic experiment for Al-Mg-Si(6061-T6) Al alloy in seawater environment.

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References

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