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http://dx.doi.org/10.5695/JKISE.2019.52.1.23

Investigation on Electrolytic Corrosion Characteristics with the Variation of Current Density of 5083-H321 Aluminum Alloy in Seawater  

Kim, Young-Bok (Division of Marine Engineering, Mokpo National Maritime University)
Kim, Seong-Jong (Division of Marine Engineering, Mokpo National Maritime University)
Publication Information
Journal of the Korean institute of surface engineering / v.52, no.1, 2019 , pp. 23-29 More about this Journal
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
Aluminum alloy; Electrolytic corrosion; Current density; Seawater;
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