Abstract: The invention relates to a cathodically depositable aqueous electropaints which contain cationic amine-modified epoxy resins and are pigmented, with electroconductive carbon black and which, on deposition and crosslinking, provide electrophoroetically overcoatable coatings and contain as electroconductive carbon black a carbon black having an iodine absorption of 870-930 mg/g, a specific surface area (BET/N.sub.2) of 850-1,000 m.sup.2 /g, a pore volume (DBP) of 330-390 ml/100 g and an average particle size of 25-35 nm in an amount of 1.5 to 5.1% by weight--based on total solids.

Abstract: A process for removing from electrocoating baths impurities which cause surface defects.The invention relates to a process for removing from electrocoating baths impurities which cause surface defects, wherein the electrocoating paint, in addition to the purification operations which are already conventional, is filtered without pressure through an adsorbent which adsorbs hydrophobic substances having a surface tension.ltoreq.35 mN/m--preferably homopolymers or copolymers of ethylene, propylene, but-1-ene or but-2-ene, which, if appropriate, contain further nonpolar comonomers.

Abstract: The invention relates to cathodically depositable aqueous electropaints which contain cationic amine-modified epoxy resins and are pigmented with electroconductive carbon black and which, on deposition and crosslinking, provide electrophoretically overcoatable coatings and contain as electroconductive carbon black a carbon black having an iodine absorption of 870-930 mg/g, a specific surface area (BET/N.sub.2) of 850-1,000 m.sup.2 /g, a pore volume (DBP) of 330-390 ml/100 g and an average particle size of 25-35 nm in an amount of 1.5 to 5.1% by weight - based on total solids.