电偶腐蚀数值模型的边界条件优化研究  

Optimization of boundary conditions for numerical model of galvanic corrosion

作　　者：李双 鲍学伟 郝安峰 李河金 孙文[1] 王立达[1] 刘贵昌[1] LI Shuang;BAO Xue-wei;HAO An-feng;LI He-jin;SUN Wen;WANG Li-da;LIU Gui-chang(School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China;Shandong Chambroad Petrochemicals Co.,Ltd.,Binzhou 256500,China)

机构地区：[1]大连理工大学化工学院,辽宁大连116024 [2]山东京博石油化工有限公司,山东滨州256500

出　　处：《现代化工》2023年第11期121-127,共7页Modern Chemical Industry

基　　金：国家自然科学基金项目(21978036)。

摘　　要：提出了一种新颖的极化曲面边界条件设置方式,实现了腐蚀微环境实时变化对腐蚀动态影响的全过程数值模拟。考虑到AE44镁合金/Q235碳钢电偶对阴极为析氢反应,腐蚀环境主要涉及到的因素是溶液pH的变化,因此,研究了pH对电位-电流极化曲线的影响。通过建立模型系统研究了不同边界条件设置对模拟结果的影响,结果表明,当模型边界条件中考虑溶液pH的变化时,模拟结果最接近实验真实值,此模型模拟的精确度最大为94.10%,高于Tafel方程边界的54.87%和极化曲线边界的89.97%。A novel polarized surface boundary condition setting method is proposed to achieve the full process numerical simulation of the impact of real-time corrosion microenvironment changes on corrosion dynamics.Considering the hydrogen evolution reaction between AE44 magnesium alloy/Q235 carbon steel galvanic couple and cathode,the main factor involved in the corrosion environment is the change in solution pH.Therefore,the effect of pH on the potential-current polarization curve is studied.The influence of different boundary condition settings on simulation results is evaluated through establishing a model system.The results indicate that the simulation results approach the actual experimental values when considering the changes of solution pH in the model boundary conditions.The maximum accuracy of this model simulation is 94.10%,which is higher than 54.87%of the Tafel equation boundary and 89.97%of the polarization curve boundary.

关 键 词：数值模拟 电偶腐蚀 极化曲面 边界条件优化 腐蚀产物沉积 

分 类 号：TQ150[化学工程—电化学工业]