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09520 Effect of Calcareous Deposit Formation on Galvanic Anode Cathodic Protection of Steel in Seawater

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.

Product Number: 51300-09520-SG
ISBN: 09520 2009 CP
Author: Julissa L. Solis-Romero and Juan Genesca
Publication Date: 2009
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$20.00
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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

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

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