Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Influence of Heat Treatment and Magnesium Content on Corrosion Resistance of Al-Mg Coated Steel Sheet

PVD법에 의해 제작한 Al-Mg 코팅 강판의 내식성에 미치는 Mg 함량 및 열처리의 영향

  • Kang, Jae Wook (Div. of Marine Engineering, Korea Maritime and Ocean University) ;
  • Park, Jun-Mu (Div. of Marine Engineering, Korea Maritime and Ocean University) ;
  • Hwang, Sung-Hwa (Div. of Marine Engineering, Korea Maritime and Ocean University) ;
  • Lee, Seung-Hyo (Div. of Marine Engineering, Korea Maritime and Ocean University) ;
  • Moon, Kyung-Man (Dept. of Marine Equipment Engineering, Korea Maritime and Ocean University) ;
  • Lee, Myeong-Hoon (Div. of Marine Engineering, Korea Maritime and Ocean University)
  • 강재욱 (한국해양대학교 해사대학 기관공학부) ;
  • 박준무 (한국해양대학교 해사대학 기관공학부) ;
  • 황성화 (한국해양대학교 해사대학 기관공학부) ;
  • 이승효 (한국해양대학교 해사대학 기관공학부) ;
  • 문경만 (한국해양대학교 공과대학 조선기자재 공학과) ;
  • 이명훈 (한국해양대학교 해사대학 기관공학부)
  • Received : 2016.04.18
  • Accepted : 2016.04.29
  • Published : 2016.04.30
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Abstract

This study was intended to investigate the effect of the amount of magnesium addition and heat treatment in the Al-Mg coating film in order to improve corrosion resistance of aluminum coating. Al-Mg alloy films were deposited on cold rolled steel by physical vapor deposition sputtering method. Heat treatment was fulfilled in an nitrogen atmosphere at the temperature of $400^{\circ}C$ for 10 min. The morphology was observed by SEM, component and phase of the deposited films were investigated by using GDLS and XRD, respectively. The corrosion behaviors of Al-Mg films were estimated by exposing salt spray test at 5 wt.% NaCl solution and measuring polarization curves in deaerated 3 wt.% NaCl solution. With the increase of magnesium content, the morphology of the deposited Al-Mg films changed from columnar to featureless structure and particle size was became fine. The x-ray diffraction data for deposited Al-Mg films showed only pure Al peaks. However, Al-Mg alloy peaks such as $Al_3Mg_2$ and $Al_{12}Mg_{17}$ were formed after heat treatment. All the sputtered Al-Mg films obviously showed good corrosion resistance compared with aluminum and zinc films. And corrosion resistance of Al-Mg film was increased after heat treatment.

Keywords

References

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