Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Effect of the Coating Structure on the Corrosion Resistance of Al-Mg Coated Steel

Al-Mg 코팅층의 구조가 강판 내식성에 미치는 영향

  • Jung, Jae-Hun (Materials Solution Research Group, Research Institute of Industrial Science & Technology) ;
  • Yang, Ji-Hoon (Materials Solution Research Group, Research Institute of Industrial Science & Technology) ;
  • Kim, Sung-Hwan (Materials Solution Research Group, Research Institute of Industrial Science & Technology) ;
  • Byeon, In-Seop (Materials Solution Research Group, Research Institute of Industrial Science & Technology) ;
  • Jeong, Jae-In (Materials Solution Research Group, Research Institute of Industrial Science & Technology) ;
  • Lee, Myeong-Hoon (Korea Maritime and Ocean University)
  • 정재훈 (포항산업과학연구원 소재이용연구그룹) ;
  • 양지훈 (포항산업과학연구원 소재이용연구그룹) ;
  • 김성환 (포항산업과학연구원 소재이용연구그룹) ;
  • 변인섭 (포항산업과학연구원 소재이용연구그룹) ;
  • 정재인 (포항산업과학연구원 소재이용연구그룹) ;
  • 이명훈 (한국해양대학교)
  • Received : 2016.10.21
  • Accepted : 2016.10.30
  • Published : 2016.10.31
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Abstract

Double-layered Al-Mg films have been deposited by using an e-beam deposition method on a cold-rolled steel sheet(CR), which the structure of the film was Al/Mg/CR. The micro-structure, alloy phase, and corrosion resistance of the Al-Mg coated CR were investigated before and after heat treatment at $400^{\circ}C$ for 2, 3, and 10 min in a nitrogen atmosphere. Total thickness of Al-Mg films was fixed at $3{\mu}m$ and the thickness ratio of Al and Mg layers(Al:Mg) has been changed from 5:1 to 1:5. The cross-sectional morphology of the films, which had the thickness ratio of 2:1(Al:Mg), 1:1, and 1:2, was changed after heat treatment from columnar to featureless structure. The x-ray diffraction data for as-deposited films showed only pure Al and Mg peaks. Al-Mg alloy peaks such as $Al_3Mg_2$ and $Al_{12}Mg_{17}$ phase appeared after the heat treatment. The Al-Mg coating with the thickness ratio of 1:1(Al:Mg) showed the best corrosion resistance of up to 500 hours by salt spray test.

Keywords

References

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