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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

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.

Keywords

Coating;Impedance;Immersion;Resistance;Sea water;SEM

Acknowledgement

Supported by : 해양수산부

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