Characteristics of corrosion electric field model and analysis of genesis of singular peaks in submarine propeller area

To address the problem that the boundary conditions affect the electric field signal characteristics when the boundary element method is used to derive the electric field distribution of corrosion in submarines, resulting in the phenomenon of singular peaks in the propeller area, the measured polarization curves of marine 921 alloy steel and nickel bronze propeller materials were used as the modeling boundary conditions, and the electric field characteristics under constant potential and nonlinear boundary conditions were analyzed. By establishing the equivalent circuit of hull propeller electrochemical impedance under the parameters of impedance spectrum, the reason of the singular peak in the propeller area of submarine corrosion electric field was analyzed. The simulation results show that the characteristic distribution of submarine electric field and the phenomenon of singular peak in propeller area are related to the electrochemical polarization state of submarine material, and setting the nonlinear polarization boundary parameters reasonably can achieve the effect of weakening the singular peaks and smoothing the corrosion of the electric field model.