Underwater Potential Characteristics of Static Electric Field Related to Ship Corrosion

Abstract

In order to deeply analyze the characteristics of the ship’s static electric field signals, the underwater potential characteristics of static electric field related to ship corrosion were studied based on the ship model test and the measured data of the planar potential measurement array at sea. Firstly, based on the ship model test, the characteristics of the ship’s static electric field signals under the cathodic protection system were analyzed, and it was found that the cathodic protection system had a great influence on the magnitude of static electric field signals. Secondly, the time domain and frequency domain of underwater potential signals of typical ships obtained from the measured data at sea were analyzed. The results show that the static electric field energy is mainly concentrated in the frequency band of 0-0.1 Hz. Finally, according to the distribution rule of underwater potential, it is found that when 12 dB is taken as the detection threshold, and the distance between adjacent sensors is no more than 320 m at a shallow depth of 240 m, the sensor array can accurately detect the ship’s electric field with a surface equivalent source intensity of 10 A·m.

Keywords

• ship
• static electric field related to corrosion
• cathodic protection system
• underwater potential