Abstract
Conductor-insulator composite films were prepared by cathodic electro-deposition of a dispersion of conductive carbon black and epoxy resin onto tricationic-phosphated galvanized steel panels. The prepared composite films were then characterized regarding their surface and bulk fractality using the electrochemical impedance spectroscopy. A novel method was offered for the first time to determine the fractal dimension of the conductive paths in the bulk of the films. It was found that increasing the carbon black content from 2 to 8 percent causes the fractal dimension of the electro-active region at the film-solution interface (2D-fractal dimension) to increase from 1.47 to 2.61 while it results in a decrease of the fractal dimension of the conductive paths inside the composite films (3D-fractal dimension) from 2.6 to 2.27.
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