Trials on three steel tugs with impressed current cathodic protection systems using graphite anodes are described. The trial results indicate that operation of a graphite anode impressed current cathodic protection system, at reasonable current outputs, requires shielding of the hull around the anodes to obtain uniform current spread at low currents. Paint films have not been found satisfactory as they break down under the relatively high voltage drop (5.5 volts) occurring with graphite anodes. Satisfactory shielding was obtained with vulcanized rubber and results indicate that flame sprayed polymers also may be satisfactory.

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Copyright 1953 by the National Association of Corrosion Engineers.
1953
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