Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Improvement of Corrosion Resistance by Mg Films Deposited on Hot Dip Aluminized Steel using a Sputtering Method

용융알루미늄 도금 강판 상에 스퍼터링법으로 형성된 마그네슘 코팅막에 의한 내식성 향상

  • Park, ae-Hyeok (Division of Marine Engineering, Korea Maritime and Ocean University) ;
  • Kim, Soon-Ho (Division of Marine Engineering, Korea Maritime and Ocean University) ;
  • Jeong, Jae-In (Materials Solution Research Group, Research Institute of Industrial Science & Technology) ;
  • Yang, Ji-Hoon (Materials Solution Research Group, Research Institute of Industrial Science & Technology) ;
  • Lee, Kyung-Hwang (Materials Solution Research Group, Research Institute of Industrial Science & Technology) ;
  • Lee, Myeong-Hoon (Division of Marine Engineering, Korea Maritime and Ocean University)
  • 박재혁 (한국해양대학교 해사대학 기관공학부) ;
  • 김순호 (한국해양대학교 해사대학 기관공학부) ;
  • 정재인 (포항산업과학연구원 소재이용연구그룹) ;
  • 양지훈 (포항산업과학연구원 소재이용연구그룹) ;
  • 이경황 (포항산업과학연구원 소재이용연구그룹) ;
  • 이명훈 (한국해양대학교 해사대학 기관공학부)
  • Received : 2018.08.14
  • Accepted : 2018.08.28
  • Published : 2018.08.31
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Abstract

In this study, Mg films were prepared on hot dip aluminized steel (HDA) by using a sputtering method as a high corrosion resistance coating. The corrosion resistance of the Mg films was improved by controlling the morphology and the crystal structure of films by adjusting the Ar gas pressure during the coating process. Anodic polarization measurement results confirm that the corrosion resistance of the Mg films was affected by surface morphology and crystal structure. The corrosion resistance of the Mg coated HDA specimen increased with decreasing crystal size of the Mg coating and it was also improved by forming a film with denser morphology. The crystal structure oriented at Mg(101) plane showed the best corrosion resistance among crystal planes of the Mg metals, which is attributed to its relatively low surface energy. Neutral salt spray test confirmed that corrosion resistance of HDA can be greatly improved by Mg coating, which is superior to that of HDG (hot dip galvanized steel). The reason for the improvement of the corrosion resistance of Mg films on hot dip aluminized steel was due to the barrier effect by the Mg corrosion products formed by the corrosion of the Mg coating layer.

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References

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