Current optimization control technology of impressed current cathodic protection system with electric field stealth

Based on the impressed current cathodic protection system and its current output mode, in order to achieve the purpose of taking into account the underwater electric field stealth on the basis of hull anticorrosion function, the “integrated” method was adopted to replace the traditional “zonal” anodic current control method, and the current adjustment strategy based on underwater electric field and reference potential measurement information was proposed. The main idea is to transform the cathodic protection current optimization problem with respect to natural corrosion state into the minimization problem of the electric field increment under water with respect to electric field stealth. The effectiveness of the proposed current optimization control method was verified through the simulation calculation and shrinkage ratio model test. The results show that when the peak-peak potential is taken as the evaluation criterion and the whole ship′s electrical potential meets the anticorrosion requirements, the peak-peak potential of the 1.0B depth measurement plane can be reduced by more than 20% compared with that in the natural corrosion state of the ship. Moreover, the proposed method can quickly calculate the output current of each anode required by the impressed current cathodic protection system for both electric field stealth and hull anticorrosion.