Aluminium alloy sacrificial anodes are often used to protect marine structures from corrosion in seawater due to their high electrochemical properties. However, there exist some cases such as in ship ballast tank, where the anodes are often immersed in seawater when the tank is ballasted and exposed in the atmosphere with the tank empty. This condition affects the performance of the sacrificial anode. In this paper, we study the properties of an Al-Zn-In-Cd alloy anode with cyclic immersion in seawater in the laboratory. It has been found that the performance of the anode decreases with the wet/dry cycles, showing rising working potential positively and reducing electrical capacity as compared with the condition of full immersion. The testing conditions like atmosphere environment, the period of immersion, and the wet/dry ratio also have significant effects on the performance of the anode.

Subject
Test methods, Galvanic anodes, Anode potential, Aluminum, Zinc anodes, Atmosphere, Anode surfaces, Seawater, Corrosion products, Testing conditions, Immersion, Aluminum alloys, Anodes
Keywords:
aluminium alloy, sacrificial anode, electrochemical properties, cyclic immersion
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2010
Association for Materials Protection and Performance (AMPP)
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