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Aluminium alloy sacrificial anodes are often used to protect marine structures due to their high electrochemical properties. Anodes are often immersed in seawater when the tank is ballasted and dry with the tank empty. We study the properties of an Al-Zn-In-Cd alloy anode with cyclic immersion in seawater in the laboratory.
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. Key words: aluminium alloy, sacrificial anode, electrochemical properties, cyclic immersion
How calcareous deposits formation in seawater influences the performance of a galvanic cathodic protection (CP) system in seawater. Coupling current measured. A resistance set between the cathode and the anode simulated circuit resistance of CP. Steel cathode potential over immersion time. Calcareous deposits analyzed by X-Ray Diffraction.
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This paper contains a review of commonly used practices and presents a generalized technique for the calculation of earth potentials for the determination of remoteness of impressed current anode ground beds. The intent is to facilitate proper design and evaluation of anode ground beds of impressed current cathodic protection system for cross-country pipelines.
Analysis of the Sunde’s equation for multiple electrodes in horizontal configurationsis done in order to show that this equation cannot be used in the case of typical cathodic protection design. An accurate approach to horizontal anode groundbed design and understanding of the theory behind groundbed resistance equations.