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一、前言油漆涂层是防止金属腐蚀的常用措施。近年来,人们用电化学方法测定涂层的耐腐蚀性能。Piens等人利用极化电阻测量,得到金属的腐蚀速率。极化电阻技术应用于电荷迁移为控制步骤的电极体系时,常常是正确的;但在带涂层条件下测量极化电阻时,涂层本身的电阻包含于极化电阻之中,这在求腐蚀速度时必须加以考虑,否则会得出不正确的结果。交流阻抗技术避免了极化电阻技术的缺陷,可以给出涂层的阻抗和电容值,以及涂层下金属界面的信息。交流阻抗
First, the preface Paint coating is a common measure to prevent metal corrosion. In recent years, people use the electrochemical method to determine the coating’s corrosion resistance. Piens et al. Use polarization resistance measurements to obtain the metal corrosion rate. Polarization resistance techniques are often correct when applied to electrode systems where charge transfer is the control step; however, when measuring polarization resistance with coating conditions, the resistance of the coating itself is included in the polarization resistance, Corrosion rates must be taken into account or you will get incorrect results. AC impedance technology to avoid the shortcomings of polarization resistance technology, you can give the impedance and capacitance of the coating, as well as the coating under the metal interface information. AC impedance