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Evaluation of Corrosion Tendency for S355ML Steel with Seawater Temperature

해수 온도에 따른 S355ML 강재의 부식 경향 평가

  • Jang, Seok Ki (Division of Marine Engineering, Mokpo National Maritime University) ;
  • Lee, Seung Jun (Department of Power System Engineering, Kunsan National University) ;
  • Park, Jae Cheul (Machinery Technology Research Team, Korean Register) ;
  • Kim, Seong Jong (Division of Marine Engineering, Mokpo National Maritime University)
  • 장석기 (목포해양대학교 기관시스템공학부) ;
  • 이승준 (군산대학교 동력기계시스템공학과) ;
  • 박재철 (한국선급 기술본부 기관기술연구팀) ;
  • 김성종 (목포해양대학교 기관시스템공학부)
  • Received : 2015.06.16
  • Accepted : 2015.10.13
  • Published : 2015.10.31

Abstract

Corrosion is of greatest concern for metallic materials exposed to corrosive seawater or aggressive marine atmospheres. Marine structures and components made of metallic materials incur an initial cost and additional large costs for corrosion control and maintenance. There have been worldwide efforts to minimize marine corrosion and extend service life of the materials. It is believed that various factors are associated with corrosion of marine grade metallic materials, particularly the temperature of the solution affecting the corrosion rate by changing dissolved oxygen solubility and concentrations of chloride. In the present study, the electrochemical characteristics of S355ML steel are investigated to identify corrosion acceleration tendencies with changes in solution temperature under marine environments. It was found that increasing seawater temperature, promoted not only activation of chloride ion transfer, but also the formation of porous $Fe(OH)_3$ or $Fe_2O_3$, leading to the acceleration of corrosion.

Keywords

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