Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Corrosion Resistance Evaluation of Aluminum Thermal Spray Coated AA5083-H321

알루미늄 열용사 코팅된 AA5083-H321의 내식성 평가

  • Il-Cho Park (Division of Cadet Training, Mokpo National Maritime University) ;
  • Sungjun Kim (Waipio) ;
  • Min-Su Han (Division of Marine Engineering, Mokpo Maritime University)
  • 박일초 (목포해양대학교 승선실습과정부) ;
  • 김성준 ((주)와이피오) ;
  • 한민수 (목포해양대학교 기관시스템공학부)
  • Received : 2023.01.30
  • Accepted : 2023.02.14
  • Published : 2023.04.30
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Abstract

In this study, anti-corrosion effect was investigated through various electrochemical experiments after applying Al thermal spraying technology to AA5083-H321. Open circuit potential and anodic polarization curves were analyzed through electrochemical experiments in natural seawater. The shape of the surface was observed using a scanning electron microscope (SEM) and a 3D microscope before and after the experiment. Component and crystal structure were analyzed through EDS and XRD. As a result, the surface roughness of AA5083-H321 and the Al thermal sprayed coating layer increased due to surface damage caused by anodic dissolution reaction during the anodic polarization experiment. The corrosion rate of AA5083-H321 was relatively low because the Al thermal spray coating layer contained structural defects such as pores and crevices. Nevertheless, the open circuit potential of the Al thermal spray coating layer in natural seawater was measured about 0.2 V lower than that of AA5083-H321. Thus, a sacrificial anode protection effect can be expected.

Keywords

Acknowledgement

본 과제(결과물)은 교육부와 한국연구재단의 재원으로 지원을 받아 수행된 3단계 산학연협력 선도대학 육성사업(LINC3.0)의 연구결과입니다.

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