Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Experimental Study on Coating Corrosion Characteristics of Heat Exchanger for Sea Water

해수용 열교환기의 코팅 부식특성 실험연구

  • Kwon, Young-Chul (Department of Mechanical Engineering, Sunmoon University) ;
  • Kim, Ki-Young (Department of Mechanical Engineering, Sunmoon University) ;
  • Huh, Cheol (Offshore CCS Research Unit, Maritime & Ocean Engineering Research Insititue, Korea Institute of Ocean Science and Technology) ;
  • Cho, Meang-Ik (Offshore CCS Research Unit, Maritime & Ocean Engineering Research Insititue, Korea Institute of Ocean Science and Technology) ;
  • Kwon, Jeong-Tae (School of Mechanical Engineering, Hoseo University)
  • 권영철 (선문대학교 기계공학과) ;
  • 김기영 (선문대학교 기계공학과) ;
  • 허철 (한국해양과학기술원 선박해양플랜트연구소 해양CCS연구단) ;
  • 조맹익 (한국해양과학기술원 선박해양플랜트연구소 해양CCS연구단) ;
  • 권정태 (호서대학교 기계공학부)
  • Received : 2013.08.22
  • Accepted : 2013.09.06
  • Published : 2013.09.30
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Abstract

In the present study, coating corrosion characteristics of the heat exchanger for sea water are experimentally investigated. Coating types by a teflon, an electrodeposition and a ceramic+silicon were tested and compared with the corrosion characteristics of an aluminum. For the acceleration of corrosion by sea water, the temperature of sea water $70^{\circ}C$ and the concentration of salt 3.5% were considered. And the specimens were immersed in sea water during 9 weeks. Coating corrosion characteristics were measured by using the impedance method and SEM. Experimental results showed that polarization resistances obtained from Bode plot were related to the corrosion resistance of coating types, and the corrosion resistance of double coating were maintained during 4 weeks. From SEM photograph, we saw that blisters was generated on the interface between metal and coating.

본 연구에서는 해수용 열교환기의 코팅에 따른 해수 부식특성을 조사하기 위해 실험이 수행되었다. 코팅은 테플론, 전착, 세라믹+실리콘 3종을 선정하였고, 코팅되지 않은 알루미늄 부식과 비교하였다. 해수부식을 가속시키기 위하여 $70^{\circ}C$ 고온의 농도 3.5% 인공해수를 제작하여 9주 동안 침지부식을 시켰다. 침지기간에 따른 코팅의 부식특성 변화를 관찰하기 위하여 임피던스 분광법과 SEM을 이용하였다. Bode 선도에서 얻어진 분극저항으로부터 코팅재질의 내부식성을 확인하였다. 이중코팅은 4주 이후에도 코팅의 내부식성을 유지하였다. 또한 침지기간에 따라서 금속모재와 점착된 코팅면 사이에 블리스터가 발생할 수 있음을 확인하였다.

Keywords

References

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