한국해양공학회지 (Journal of Ocean Engineering and Technology)

  • 제22권3호
  • /
  • Pages.82-88
  • /
  • 2008
  • /
  • 1225-0767(pISSN)
  • /
  • 2287-6715(eISSN)
한국해양공학회 (Korean Society of Ocean Engineers)
권호 표지

배기밸브 보수 용접부의 부식 특성에 관한 전기화학적 연구

An Electrochemical Study on Corrosion Property of Repair Welding Part for Exhaust Valve

  • 문경만 (한국해양대학교 공과대학 기계소재공학부) ;
  • 이규환 (한국해양수산연수원 교육연구) ;
  • 조황래 (한국해양대학교 공과대학 기계소재공학부) ;
  • 이명훈 (한국해양대학교 해사대학 기관시스템공학부) ;
  • 김윤해 (한국해양대학교 공과대학 기계소재공학부) ;
  • 김진경 (한국해양수산연수원 교육연구)
  • Moon, Kyung-Man (Dept. of Mechanical and Materials Engineering, Korea Maritime Univ.) ;
  • Lee, Kyu-Hwan (Education and Research Division, Korea Institute of Maritime and Fisheries Technology) ;
  • Cho, Hwang-Rae (Dept. of Mechanical and Materials Engineering, Korea Maritime Univ.) ;
  • Lee, Myung-Hoon (Dept. of Marine System Engineering, Korea Maritime Univ.) ;
  • Kim, Yun-Hae (Dept. of Mechanical and Materials Engineering, Korea Maritime Univ.) ;
  • Kim, Jin-Gyeong (Education and Research Division, Korea Institute of Maritime and Fisheries Technology)
  • 발행 : 2008.06.30
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초록

The diesel engine of the merchant ship has been aperated in severe environments more and more, because the temperature of the exhaust gas of a combustion chamber is getting higher and higher with increasing use of heavy oil of law quality, due to the significant increase in the price of oil in recent some years. As a result, the degree of wear and corrosion between exhaust valve and seat ring is more serious compared to other engine parts. Thus the repair welding of exhaust valve and seat ring is a unique method to prolong the life of the exhaust valve, from an economical point of view. In this study, the corrosion property of both weld metal and base metal was investigated using electrochemical methods such as measurement of corrosion potential, cathodic and anodic polarization curves, cyclic voltammogram, and polarization resistance in 5% H2SO4 solution. The test specimen was a part of an exhaust valve stem being welded as the base metal, using various welding methods. In all cases, the corrosion resistance as well as hardness of the weld metal zone was superior to the base metal. In particular, plasma welding showed relatively good properties for both corrosion resistance and hardness, compared to other welding methods. In the case of DC SMAW (Shielded metal arc welding), corrosion resistance of the weld metal zone was better than that of the base metal, although its hardness was almost same as the base metal.

키워드

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