Investigation and modelling of edge corrosion of e-coated galvanized steel with respect to the spatial edge orientation,Materials and Corrosion

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Investigation and modelling of edge corrosion of e-coated galvanized steel with respect to the spatial edge orientation
Materials and Corrosion ( IF 1.6 ) Pub Date : 2021-08-03 , DOI: 10.1002/maco.202112636
Konstantin Kapfer ₁ , Marcel Mandel ₂ , Andreas Mittelbach ₁ , Lutz Krüger ₂

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The effect of the spatial orientation of e-coated hot dip galvanized test sheets on edge corrosion is investigated. Therefore paint delamination from corrosion sample edges at different steps in time of samples at different angles relative to the horizontal during a corrosion test is analysed. Two general relations are found: Horizontally oriented edges exhibit significantly increased coating delamination compared with vertically oriented edges. This is due to increased exposure to the electrolyte, resulting from the pinning of electrolyte droplets along the upper edge. With increasing angular displacement relative to the ground, electrolyte exposure and edge delamination decrease. The edges of the upward-facing specimen side showed a higher delamination width compared with the downward-facing side at the same angle. These results are supported by electrochemical impedance spectroscopy and a wetting test. Ultimately, a semi-empirical model to numerically predict the edge delamination over time, incorporating electrochemical impedance spectroscopy and polarization curves, is presented.

中文翻译：

电子涂层镀锌钢边缘腐蚀的空间边缘取向调查与建模

研究了电子涂层热浸镀锌试板的空间取向对边缘腐蚀的影响。因此，在腐蚀测试期间，分析了在相对于水平的不同角度的样品的不同时间步骤中从腐蚀样品边缘的油漆分层。发现了两个一般关系：与垂直取向的边缘相比，水平取向的边缘表现出显着增加的涂层分层。这是由于电解液液滴沿上边缘钉扎导致的电解液暴露增加。随着相对于地面的角位移增加，电解液暴露和边缘分层减少。在相同角度下，与朝下侧相比，朝上样品侧的边缘显示出更高的分层宽度。这些结果得到了电化学阻抗谱和润湿测试的支持。最后，提出了一个半经验模型，结合电化学阻抗谱和极化曲线，以数值方式预测随时间的边缘分层。

更新日期：2021-08-03

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