不同极化条件下舰船表体电位与大轴电流密度的关系验证

摘要

针对目前建立舰船电场模型单纯引入极化曲线,未充分考虑不同极化条件下大轴电流密度与舰船表体电位的函数关系问题,提出了不同极化条件下的舰船表体电位与大轴电流密度的关系验证方法.该方法分别在高过电位区和低过电位区对舰船表体电位与舰船大轴电流密度建立了两套关系函数,并给出了相关数值模拟.实验验证结果表明,舰船船壳电位偏离其自腐蚀电位0.1V以上时,船壳表体电位与大轴电流密度成对数关系;当船壳电位偏离其自腐蚀电位不足0.1V时,螺旋桨电位几乎无变化,船壳电位与大轴电流密度近似成线性关系;且越接近螺旋浆区域,船壳表体电位变化越快,但电位偏离自腐蚀电位越小.%The establishment of vessel electric field model did not fully consider the function relationship between shaft current density and the ship hull potential under different polarization conditions.So the re-lationship verification method was put forward for ship hull potential and shaft current density under differ-ent polarization conditions.The method established two relationships between ship hull potential and shaft current density under high overpotential area and low overpotential area.Numerical simulation was given and validated by experiments.The experimental results showed that,firstly,when the overpotential of ship hull deviates above 0.1 V,the relationship was almost logarithm between the hull potential and shaft current density;secondly,when the overpotential deviated less than 0.1 V,propeller potential had no change and hull potential changes linearly with shaft current density;thirdly,the closer to the propeller ar-ea was,the more quickly the hull potential changed,but the smaller hull potential deviated from the self-corrosion potential.