阴极保护的有限元仿真计算是一种有效的数值计算方法。三维计算时为了解LAPLACE方程，采用8节点立体单元剖分场域、构造插值函数，通过每个单元的分析和整体合成建立了三维有限元模型，并给出了电流电位分布等值线图。最后设计了一套全自动钢表面电位扫描验证系统，将三维情况下模型计算值和实验验证测量值进行了比较。%Finite element technique can be used to predicting distributions of CP electrochemicalfield in complex system. To solve LAPLACE equation, cubic unit with 8 points and appropriate function were applied to discrete structure surface and its environment. Through analysis of each unit and synthesis in the whole area, mathematical model of 3-Dfinite element and a computing program were constructed. The study also gave potential and iso-current density distributions and proved that the result complied with classical electric principles. At last, the study designed a set of automatic potential scanning system for potential on steel surface and compared the experimental results with the values from numerical computation.
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