层流介质中金属板腐蚀电位分布研究

Corrosion potential distribution research of metal plate in laminar flow

为了研究流动介质中产生的静电场,结合电化学和流体力学相关知识建立层流介质中金属板模型,利用贝塞尔函数展开及其逆运算推导出在三层介质中基于点电荷模型的腐蚀电位解析表达式,同时计算出金属板产生的电场。运用推导出的解析表达式计算出在流动介质中任意场点处金属板随不同流速产生的腐蚀电位,并通过实验验证结果的正确性。结果表明,对层流条件下电化学反应产生的电流密度所建模型的结果与实验测量数据吻合度较高,同时电场分布也会随着流体流速及层流方向上长度的变化而发生变化。

In order to study the electrostatic field in the flowing medium,the model of metal plate in the laminar flow was built on the basis of the related knowledge of electrochemistry and fluid mechanics,and the analytic expression of corrosion potential based on point charge source in the three-layered media model was deduced by using the expansion of Bessel function and its inverse operation,then the expression of electric field was obtained in the meantime. The corrosion potential of metal plate varying from different flow rates at arbitrary seawater depth was calculated by the listed expression. The simulation result was tested and verified through experiment. The result shows that the model in current density generated in the electrochemical reaction under laminar flow conditions is in better agreement with the experimental data,and the electric field distribution changes with the flow velocity and the length of the laminar flow direction.