Journal of Surface Science and Engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Electrochemical Corrosion Evaluation of Aluminum Alloy Weldment Prepared by GMAW Process

알루미늄 합금 GMAW 용접부의 전기화학적 방법에 의한 내식성 평가

  • Yang, Ye-Jin (Division of Marine Engineering, Mokpo National Maritime University) ;
  • Park, Il-Cho (Division of Marine Engineering, Mokpo National Maritime University) ;
  • Lee, Jung-Hyung (Division of Marine Engineering, Mokpo National Maritime University) ;
  • Han, Min-Su (Division of Marine Engineering, Mokpo National Maritime University) ;
  • Kim, Seong-Jong (Division of Marine Engineering, Mokpo National Maritime University)
  • 양예진 (목포해양대학교 기관시스템공학부) ;
  • 박일초 (목포해양대학교 기관시스템공학부) ;
  • 이정형 (목포해양대학교 기관시스템공학부) ;
  • 한민수 (목포해양대학교 기관시스템공학부) ;
  • 김성종 (목포해양대학교 기관시스템공학부)
  • Received : 2017.12.18
  • Accepted : 2017.12.28
  • Published : 2017.12.31
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Abstract

The aim of the present study is to evaluate electrochemical corrosion characteristics of base metal and weldment of Al-Mg alloy in seawater solution. The specimen was 5mm thick 5083-H321 Al alloy plate which was butt-welded using gas metal arc welding (GMAW). To identify the types of inclusions in the weldment, the microstructural observation was performed along with Energy dispersive spectrometer (EDS) analysis. The anodic polarization experiments were performed to evaluate the corrosion characteristics. After the anodic polarization test, the corroded surface was observed by SEM(scanning electron microscope) and EDS. The result of the analysis revealed a large number of voids in the weldment, especially coarse grains and inclusions in the heat affected zone. The corrosion current density of the weldment was found to be approximately 13 times higher than that of the base metal, indicating lower corrosion resistance of the weldment due to the defects in the weldment and the heat affected zone.

Keywords

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