Xiao Feng, Tian-Yu Wang, Fang-Yuan Cao, De-Ming Xie, Hai-Hua Li
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引用次数: 0
摘要
本文研究了三种阻抗光谱,即两种锌粉(新锌粉和旧锌粉)和五种涂层(两种不同厚度的环氧富锌涂层(EZRC)、硅酸乙酯富锌涂层、环氧涂层和自沉积涂层)在 3.5 wt.% 氯化钠溶液中的阻抗谱、两种涂层(较厚的 EZRC 和自沉积涂层)的干膜阻抗谱以及它们在 0.003 M 氯化锂-甲醇溶液中的阻抗谱。结果表明,ZRC 在浸泡初期的高频阻抗的电阻部分是锌粉之间的接触电阻(Rm),电容部分是接触电容(Cm)和粘结剂薄膜电容(Cc)的并联。两个电容的耦合导致测量的 Pm 与真实的 Pm 存在偏差,其中 Pm 是与 Cm 相关的分散系数。
Study of high-frequency impedance of zinc-rich coatings
In this paper, three types of impedance spectra were investigated, i.e., impedance spectra of two zinc powders (new and old) and five coatings (two different thicknesses of epoxy zinc-rich coatings (EZRCs), an ethyl silicate zinc-rich coating, an epoxy coating and an autodeposition coating) in 3.5 wt.% NaCl solution, dry film impedance spectra of two coatings (the thicker EZRC and autodeposition coating) and their impedance spectra in a 0.003 M LiCl–methanol solution. The results show that the resistive part of the high-frequency impedance of the ZRCs at the early stage of immersion is the contact resistance ( Rm) between the zinc powders, and the capacitive part is the parallel connection of the contact capacitance ( Cm) and the film capacitance ( Cc) of the binder. The coupling of the two capacitors results in a deviation of the measured Pm from the true Pm, where Pm is the Cm-dependent dispersion coefficient