Organic coating capacitance measurement by EIS: ideal and actual trends

被引：214

作者：

Deflorian, F ^{[1
]}

Fedrizzi, L ^{[1
]}

Rossi, S ^{[1
]}

Bonora, PL ^{[1
]}

机构：

[1] Univ Trent, Dept Mat Engn, Lab Ind Corros Control, Trent, Italy

来源：

ELECTROCHIMICA ACTA | 1999年 / 44卷 / 24期

关键词：

electrochemical impedance spectroscopy; organic coatings; water uptake; coating capacitance; delamination;

D O I：

10.1016/S0013-4686(99)00139-5

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The coating capacitance is one of the most frequently studied parameters obtained by EIS measurements for characterising the protective properties of organic coatings, because by analysing this parameter it is possible to measure the water uptake phenomena (diffusion till saturation and further increase) which are very important in barrier coatings. The ideal trend described in many cases is not representative of the actual evolution measured on coatings. Often one phase is missing or a reduction of the coating capacitance is measured. In this work the ideal trend of coating capacitance is compared with some real experimental results, discussing the reasons of disagreement and the limits of the model which seem to be in many cases insufficient and too simple to explain the actual water uptake processes. in particular, when a further increase of the coating capacitance occurs after saturation. The presence of different water uptake mechanisms, the heterogeneous distribution of the water in the coating and dimensional variations make the water uptake phenomenon quite complex. (C) 1999 Elsevier Science Ltd. All rights reserved.

引用

页码：4243 / 4249

页数：7

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