CATHODIC PROTECTION STUDIES
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA
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A seven-section floating dry ock was placed under cathodic protection in order to study the interaction between several hulls in a single system and to provide a protracted study of the effectiveness of cathodic protection. The feasibility of using a single power source for many hulls and the practicability of employing automatic control were investigated. The durability of the component materials in the system was observed. It was concluded that galvanic and impressed current systems are equally effective in reducing corrosion. The choice between them, or between different anode materials is largely a question of the specific application. A combination of cathodic protection and floating inhibitor in a ballast tank provides essentially 100-percent protection. Only two underwater coating systems were considered as having performed satisfactorily. A single rectifier supplied sufficient power for the seven- section drydock, plus an AFDL and three YR-class drydocks. Automatic control systems were successful in maintaining hull polarities within an acceptable range.
- Physical Chemistry