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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received September 2, 2005
Accepted May 12, 2006

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Electrochemical properties of Al and Al alloys relevant to corrosion protection in seawater environments

Seong-Jong Kim^† Jae-Yong Ko¹

Division of Marine Engineering, Mokpo Maritime University, Mokpo City, Cheonnam 530-729, Korea ¹Division of Ocean System Engineering, Mokpo Maritime University, Mokpo City, Cheonnam 530-729, Korea

ksj@mmu.ac.kr

Korean Journal of Chemical Engineering, September 2006, 23(5), 847-853(7)
https://doi.org/10.1007/BF02705939

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Abstract

A series of electrochemical experiments on Al alloys were undertaken to determine their optimum protection potentials in seawater. With 1050 and 5456 alloys, passive films form during anodic polarization but are destroyed by the Cl- in seawater, only to regrow as a result of the self-healing capacity of aluminum. The current density of 5456 Al alloy proved to be lower than that of 1050 as a whole. Any shift to more anodic or cathodic conditions in the potential range of -1.5~-0.68 V resulted in a sudden increase in current density. Current densities in the high-strength 7075 Al alloy showed the greatest values. In contrast, the current densities of 5456 alloy, known to have excellent corrosion resistance in seawater, were the lowest in the range of -0.70~-1.3 V, and we concluded that this potential range offered optimal protection.

Keywords

Electrochemical Experiments Al Alloys Protection Potentials Corrosion

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