Electric Resistance of Varnish Mixed with CF and Copper-Plated CF

The surface electric resistivity of composite coatings of CF-varnish, surface treated CF-varnish and Cu-plated CF-varnish is measured. The relationship of surface resistivity with CF contens in coating and the number of coatings is determined. Micro-morphology of above-mentioned three types of coating is observed and their electric conduction mechanism is discussed.