潜艇螺旋桨区域腐蚀电场模型特征及奇异峰成因分析

针对边界元法推算潜艇腐蚀电场分布时边界条件影响电场信号特征,导致螺旋桨区域产生奇异峰现象的问题,以实测船用921合金钢和镍青铜螺旋桨材料极化曲线作为建模边界条件,重点对比分析了恒电位和非线性边界条件下的电场特征,并通过建立阻抗谱参数下的船壳-螺旋桨电化学阻抗等效电路,分析了潜艇腐蚀电场螺旋桨区域产生奇异峰的原因。仿真结果表明:潜艇电场特征分布及螺旋桨区域奇异峰现象与船体材料电化学极化状态有关,合理设定非线性极化边界参数可达到削弱奇异峰现象、平滑腐蚀电场模型的效果。

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.