Improvement of Corrosion Properties of AL-4.08MG Alloy in Seawater by Two Step Anodizing in Electrolyte with Varied Concentration
S.J. Leea and S.J. Kimb
aKunsan National University, Department of Power System Engineering, Daehak-ro 558, Gunsan-si, Jeonbuk, Korea
bMokpo National Maritime University, Division of Marine Engineering, Haeyangdaehak-Ro 91 Mokpo-si, Korea
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Aluminum is extremely active metal on the surface of which the oxide is instantly created when exposed to atmosphere. This naturally generated film has little industrial value as it has thickness as thin as 10 nm. Hence, oxide films are often made thick by electrochemical method. The characteristics of the films can be controlled by varying process parameters including composition, concentration, additives, solution temperature, voltage etc. These films have high hardness and excellent corrosion resistance. Therefore, they are receiving great amount of attention in both academic and industrial areas with their diverse applicability. In this paper, the optimal electrolyte concentration was investigated to produce oxide film with excellent corrosion resistance. The results reveal that Al2O3 oxide film was created on the surface for all tested electrolyte concentrations. Moreover, the films have a considerably lower corrosion current density than that of the substrate, implying excellent corrosion resistance.

DOI: 10.12693/APhysPolA.129.742
PACS numbers: 75.70.-i, 82.45.Bb