Modeling and simulation of galvanic corrosion pit as a moving boundary problem
Modeling and simulation of galvanic corrosion pit as a moving boundary problem
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DOI：
10.1016/j.commatsci.2012.07.029
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发表时间：
2012-12
影响因子：
3.3
通讯作者：
Sunil Kumar Thamida
中科院分区：
文献类型：
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作者：
Sunil Kumar Thamida
在本文中，模拟和模拟了两个不同的金属表面接触形成180°接头时电偶腐蚀过程中坑形成的动力学。作为分析电偶结电流的新进展，将电偶腐蚀数学模型化为电解液中电势的拉普拉斯方程表示的移动边界问题和激活驱动阳极表面溶解。除了对电电流密度分布进行数值求解外，我们还让阳极表面溶解，并在阳极的凹坑表面进行了计算。采用极化曲线的线性模型或线性电阻模型作为阳极和阴极表面的激活边界条件。给出了坑形和电流密度随时间的变化规律。
In this article, the dynamics of pit formation during galvanic corrosion is modeled and simulated when two dissimilar metal surfaces are in contact forming an 180° joint. As a novel advancement to the analysis of galvanic junction currents, the galvanic corrosion is mathematically modeled as a moving boundary problem represented by Laplace equation for electric potential in the electrolyte and activation driven dissolution of anode surface. In addition to numerically solving for the galvanic current density distribution, we let the anode surface dissolve and perform the calculations in the pitted surface of anode. A linear model of polarization curve or the linear resistance model is applied as the activation boundary condition at the anode and cathode surfaces. The results on progression of pit shape and current density distribution with time are presented.