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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.
Durability of metallic structures immersed in natural seawater is often associated to the efficiency of protective systems which consist mainly of cathodic protection. The formation of calcareous deposit depends on the water composition, but specially, on the saturation level respect to CaCO3, and the temperature. The quality of the deposit is significantly influenced by the alkalinity next to the cathode surface, which is defined mainly by current density. The purpose of this study was to determine how calcareous deposits formation in seawater influences the performance of a galvanic cathodic protection system. Measurement of the coupling current between a cylindrical cathode (carbon steel) and a sacrificial Al anode ring was carried out as a function of time. A resistance set between the cathode and the anode was used to simulate the circuit resistance of the cathodic protection system. Additionally, steel cathode potential was registered as a function of immersion time. Calcareous deposits formed during testing were analyzed by X-Ray Diffraction. Keywords: aluminum anode, cathodic protection, monitoring, seawater
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.
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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.