Cathodically electro-deposited carbon-black-epoxy composite films as primer in two-coat electro-deposition

Electrochemical impedance spectroscopy was used to study the electrical properties of cathodically electro-deposited films containing conductive carbon black. Suggesting an electrochemical equivalent circuit for the deposited films, it was found that the current is transferred through the conductive paths which are extended throughout the films. The content in conductive carbon black was found to have a great impact on the electrical properties of the conductive films. Increasing the carbon black content of the films, also leads to a decrease in the amount of the dissipated electricity during the second deposition.