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The effects of the temperature and flow velocity on the cathodic protection and underwater electromagnetic signature of ships are investigated using electrochemical tests and boundary element simulations. The corrosion resistance of the materials for the hull and propeller increase at lower temperatures, and the corrosion resistance is significantly decreased under the flow conditions because the oxygen concentration on the surface accelerates the cathodic reaction. Due to the corrosion resistance reduction, the current requirement for cathodic protection increases under the flow conditions, while it decreases at lower temperatures. Furthermore, the underwater electromagnetic field is investigated at different axis directions. The electromagnetic field increases under the flow conditions and at higher temperatures due to the increase in the applied current for cathodic protection. †(Received October 6, 2016; Accepted November 24, 2016)

Effect of Temperature and Flow Velocity on the Cathodic Protection of Ships and Underwater Electromagnetic Signatures