Abstract
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.
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