In order to achieve optimum surface adhesion, the products are pre-treated using alkaline degreasing and optional iron or zinc phosphating. Furthermore, components may be provided with a cathodic dip coating and subsequent powder coating. During coating, epoxy resin, polyester or mixed powder coatings are applied to electroconductive materials using corona charging, an electrostatic process, and thermally cross-linked at a temperature of 160º - 200°C.