Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Evaluation of Corrosion Characteristics of Underwater Hardening Paint

수중 경화형도료의 부식특성에 관한 전기화학적 고찰

  • Moon, Kyung-Man (Dept. of Marine Equipment Engineering, Korea Maritime Univ.) ;
  • Oh, Min-Seok (Dept. of Marine Equipment Engineering, Korea Maritime Univ.) ;
  • Lee, Myung-Hoon (Dept. of Marine System Engineering, Korea Maritime Univ.) ;
  • Lee, Syung-Yul (Dept. of Marine Equipment Engineering, Korea Maritime Univ.) ;
  • Kim, Yun-Hae (Dept. of Marine Equipment Engineering, Korea Maritime Univ.)
  • 문경만 (한국해양대학교 조선기자재공학부) ;
  • 오민석 (한국해양대학교 조선기자재공학부) ;
  • 이명훈 (한국해양대학교 기관시스탬공학부) ;
  • 이성렬 (한국해양대학교 조선기자재공학부) ;
  • 김윤해 (한국해양대학교 조선기자재공학부)
  • Received : 2011.03.17
  • Accepted : 2011.04.22
  • Published : 2011.04.30
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Abstract

Many protection methods such as surface coating, electric protection, or other methods have been applied to the numerous steel structures widely used in continental and marine areas to control their corrosion, which is done from an economic point of view. Most of these steel structures are primarily protected by coating methods. However, some steel piles under seawater are protected by the electric protection method, that is, either using an impressed current or a sacrificial anode method. Furthermore, environmental contamination may cause a severely corrosive environment, which, in turn, causes the accelerated corrosion of steel structures. Subsequently, coated steel structures could deteriorate more rapidly than the designed lifetime because of the acid rain caused by air pollution, etc. Therefore, a coating of marine paint exposed to seawater, that is, underwater hardening painting, is increasingly required to be fast drying as well as highly corrosion resistant. In this study, five types of underwater hardening paints were prepared with different resin series and additives. Their corrosion and water resistances were investigated using electrochemical methods such as corrosion potential, polarization curves, impedance and cyclic voltammogram measurements, etc. Even though it is generally accepted that the corrosion resistance of bare steel tends to increase with a shift of the corrosion potential in the noble direction, the corrosion resistance of a sample with a coating exhibited a relatively better tendency when it had a lower corrosion potential in this study. The corrosion current density was also decreased with a decrease in the diffusion limiting current density, which may mean that there is some relationship between corrosion and water resistance. The S sample of the ceramic resin series showed the relatively best corrosion and water resistance among those of samples, while the worst corrosion and water resistance were observed for the R sample of the epoxy resin series. The corrosion and water resistance of those samples tended to deteriorate with an increase in the immersion days, and their corrosion and water resistances were considered to be apparently improved by the types of resin and additives.

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References

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