Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Investigation of Optimum Cathodic Protection Potential to Prevent Erosion with a Flow Rate of AA5083-H321 for Marine Vessels

선박용 AA5083-H321의 유속에 의한 침식손상 방지를 위한 최적 음극방식전위 규명

  • 정상옥 (DNV GL 해사팀) ;
  • 박일초 (목포해양대학교 승선실습과정부) ;
  • 김성종 (목포해양대학교 기관시스템공학부)
  • Received : 2020.10.06
  • Accepted : 2020.12.02
  • Published : 2020.12.31
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Abstract

This study investigated the erosion-corrosion characteristics of 5038-H321 aluminum alloy in a natural seawater solution through various electrochemical experiments and flow rate parameters. Cathodic polarization experiments were conducted at flow rates ranging from 4 to 12 knots. Considering the concentration polarization section representing a relatively low current density, the range of the potentiostatic experiment was determined to be -1.6 to -1.0 V. The potentiostatic experiment was conducted at various potentials for 180 minutes in seawater. After the experiment, the corrosion characteristics were evaluated by observing surface morphology and measuring surface roughness. As a result, as the applied potential was lower, the amount of calcareous deposits increased and the roughness tended to increase. On the other hand, it was confirmed that the roughness was larger in the static condition than the flow rate condition due to the influence of the flow velocity. Variations in the chemical composition with flow rate variations were analyzed by energy-dispersive spectroscopy (EDS). In conclusion, the cathodic potential of AA5083-H321 in seawater was determined to be -1.0 V.

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References

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