Current distribution in double-cylinder electrolyte cells: Application to the study of corrosion properties of organic coatings

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• 作者：E. Ló ; pez-Quiroga^a ; X.R. Nó ; voa^a ; ^{rnovoa@uvigo.es} ; C. Pé ; rez^a ; V. Vivier^b
• 关键词：EIS ; Finite element modelling ; Ionic transport ; Metal&ndash ; coating interface ; Organic coatings
• 刊名：Progress in Organic Coatings
• 出版年：2012
• 期刊代码：70_03009440
• 类别：ce
• 出版时间：June, 2012
• 卷：74
• 期：2
• 页码：400-404
• 文件大小：911 K

摘要

The ionic conductivity of an applied organic coating has been investigated using numerical finite element modelling and a double-cylinder electrochemical cell. The experimental results show that electrochemical impedance spectroscopy is able to account for ionic conductivity property of applied organic coatings in a flexible manner.

Electrochemical impedance measurements performed in a combination of three and four-electrode arrangement allows the parallel impedance to be obtained, which corresponds to the current flow parallel to the metal-coating interface.

In the three-electrode arrangement the classical barrier property is measured because all the current flows through the coating towards the metallic substrate. The parallel impedance is obtained by combining the three-electrode measurement with the four-electrode where a part of the current is forced to circulate also through the coating but parallel direction to the metal-coating interface.