Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Electrochemical Characteristics with Cavitation Amplitude Under Cavitation Erosion of 6061-T6 in Seawater

Al 6061-T6 합금의 해수 내 캐비테이션 진폭에 따른 캐비테이션-침식 조건하에서 전기화학적 특성

  • Hwang, Hyun-Kyu (Division of marine engineering, Graduate school, Mokpo national maritime university) ;
  • Kim, Seong-Jong (Division of marine engineering, Mokpo national maritime university)
  • 황현규 (목포해양대학교 기관공학과 대학원) ;
  • 김성종 (목포해양대학교 기관시스템공학부)
  • Received : 2020.12.15
  • Accepted : 2020.12.21
  • Published : 2020.12.31
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Abstract

Generally, Al alloys of 5000 and 6000 series show excellent weldability, workability, and specific strength, and are widely used in ship building. A combined experiment via cavitation erosion and corrosion damage involving 6061-T6 Al alloy was performed using potentiodynamic polarization under cavitation erosion (hybrid experiments) with amplitude (cavitation strength). The corrosion current density was approximately 52-fold higher at 30 μm than under static conditions, suggesting that the amplitude greatly affected the damage. The degree of damage increased with increasing cavitation amplitude. After the hybrid experiment, the corrosion rate was compared according to the weight loss and damage depth, and the relationship between the two values was expressed as alpha value. The alpha (α) values at amplitudes of 5 μm, 10 μm and 30 μm were 5.11, 12.81 and 8.74, respectively, suggesting that the α value at 10 μm was greater than at 5 μm, and indicating local corrosion damage. However, the α value at 30 μm was smaller than that of 10 μm, which is attributed to higher damage via uniform corrosion than damage induced by local corrosion.

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