Electrophoretic coating and preparation method, electrophoretic coating process and selective plating process

An electrophoretic coating capable of being applied to an object, comprising:

• an aqueous medium including water, a water-miscible alcohol solvent and a water-miscible ether solvent;
• a film-forming resin having a negatively charged phenolic hydroxy group and dispersed in the aqueous medium, the film-forming resin being a water soluble, acid-insoluble and alkali-soluble, unmodified linear phenolic resin not subjected to a modification treatment introducing a carboxyl group or an amino group into a molecular chain of the film-forming resin, the film-forming resin comprising a molecular weight greater than or equal to approximately 9,000 with the content of the film forming resin in the electrophoretic coating being in a range of 3% to 15% by weight;
• and
• a pH adjusting agent including an alkaline substance comprising mixture of a hydroxide, aqueous ammonia and an alkaline organic amine for controlling the pH value of the electrophoretic coating to be greater than 7 to less than or equal to 11 for negatively charging the film-forming resin,
• wherein the alcohol solvent is a C2-C6 alkyl alcohol, the ether solvent is an aliphatic diol monoether solvent, and wherein a volume ratio of the alcohol solvent to the ether solvent is in a range of 3:1 to 10:1.