Corrosion Science and Technology

The Corrosion Science Society of Korea (한국재료부식학회)
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Synergistic Behavior on Cavitation-Erosion and Corrosion of Anodized 6000 Series Aluminum Alloy for Small Ship Propellers

소형선박 프로펠러용 6000계열 알루미늄 합금의 양극산화시간에 따른 캐비테이션-침식과 부식의 복합거동

  • Dong-Ho Shin (Mokpo national maritime university) ;
  • Hyun-Kyu Hwang (Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology) ;
  • Seong-Jong Kim (Division of marine system engineering, Mokpo national maritime university)
  • 신동호 (국립목포해양대학교) ;
  • 황현규 (한국과학기술원 원자력 및 양자공학과) ;
  • 김성종 (국립목포해양대학교 기관시스템공학부)
  • Received : 2025.11.05
  • Accepted : 2025.12.10
  • Published : 2025.12.31
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Abstract

Al-Mg-Si aluminum alloys used in small ship propellers are subjected to a challenging environment where cavitation-erosion and corrosion occur simultaneously in seawater. This study explored anodized aluminum alloy as an alternative technology. We conducted indentation tests and a hybrid experiment combining electrochemical and cavitation-erosion assessments. The indentation results showed that anodized specimens treated for 10, 20 and 40 minutes had significant hardness increases of 208.282, 336.74 and 369.276 HV, respectively, compared to the base material's hardness of 94.9 HV, with a notable suppression of creep behavior. In the hybrid experiment, the anodized specimen treated for 10 minutes demonstrated a current density increase, delaying in the range of -0.8775 V to -0.7966 V, and exhibited the lowest corrosion current density of 2.55 ㎂/cm2. Following this experiment, the anodized speciment treated for 10 minutes also showed the lowest weight loss (40.9 mg), surface roughness (14.4 ㎛) and maximum damage depth (93.8 ㎛). Conversely, the specimen anodized for 40 minutes exhibited higher hardness than the 10-minute specimen, but showed an increased tendency for cracks and damage due to reduced toughness.

Keywords

Acknowledgement

본 논문은 2025년도 교육부 및 전라남도의 재원으로 전라남도RISE센터의 지원을 받아 수행된 지역혁신중심대학지원체계(RISE)의 결과입니다(2025-RISE-14-002). 또한, 2025년 전라남도와 전남테크노파크의 「전남 소재·부품·뿌리산업 연구개발대행 원스톱 지원사업」의 지원을 받아 수행된 연구입니다.

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