Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Investigation on Electrolytic Corrosion Characteristics with the Variation of Current Density of 5083-H321 Aluminum Alloy in Seawater

5083-H321 알루미늄 합금의 해수 내 전류밀도의 변화에 따른 전식 특성 연구

  • Kim, Young-Bok (Division of Marine Engineering, Mokpo National Maritime University) ;
  • Kim, Seong-Jong (Division of Marine Engineering, Mokpo National Maritime University)
  • 김영복 (목포해양대학교 기관시스템공학부) ;
  • 김성종 (목포해양대학교 기관시스템공학부)
  • Received : 2019.01.22
  • Accepted : 2019.02.25
  • Published : 2019.02.28
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Abstract

Electrolytic corrosion of the ship's hull can be occurred due to stray current during welding work using shore power and electrical leakage using shore power supply. The electrolytic corrosion characteristics were investigated for Al5083-H321 through potentiodynamic polarization and galvanostatic corrosion test in natural seawater. Experiments of electrolytic corrosion were tested at various current densities ranging from $0.01mA/cm^2$ to $10mA/cm^2$ for 30 minutes, and at various applied time ranging from 60 to 240 minutes. Evaluation of electrolytic corrosion was carried out by Tafel extrapolation, weight loss, surface analysis after the experiment. In the electrolytic corrosion characteristics of Al5083-H321 as the current density increased, the surface damage tended to proportionally increase. In the current density of $0.01mA/cm^2$ for a applied long time, the damage tended to grow on the surface. In the case of $10mA/cm^2$ current density for a applied long time, the damage progressed to the depth direction of the surface, and the amount of weight loss per hour increased to 4 mg/hr.

Keywords

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Fig. 1. Polarization curve for Tafel analysis.

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Fig. 2. Potential variation of Al5083-H321 during galvanostatic experiment at various current densities in seawater.

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Fig. 3. Weight loss and surface morphologies of Al5083-H321 after galvanostatic experiment at various current densities for 30 min in seawater.

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Fig. 4. SEM images of surface morphologies for Al5083-H321 after galvanostatic experiment at various current densities in seawater.

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Fig. 5. 3D microscopic image analysis of Al5083-H321 after galvanostatic experiment at various current densities in seawater.

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Fig. 6. Surface morphologies after galvanostatic experiment at the current densities of 0.01 mA/cm2 and 10 mA/cm2 with various applied time in seawater.

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Fig. 7. Weight loss after galvanostatic experiment at current density of 10 mA/cm2 with various applied time in seawater.

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Fig. 8. Surface morphologies after galvanostatic experiment at the current densities of 0.01 mA/cm2 and 10 mA/cm2 with various applied time in seawater.

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Fig. 9. 3D microscopic image analysis after galvanostatic experiment at the current densities of 0.01 mA/cm2 and 10 mA/cm2 with various applied time in seawater.

Table 1. Chemical compositions of Al5083-H321 (wt%)

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Table 2. Chemical compositions and properties of seawater

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