AQUEOUS COATING COMPOSITION FOR THE DIP-PAINT COATING OF ELECTRICALLY CONDUCTIVE SUBSTRATES CONTAINING BISMUTH BOTH IN DISSOLVED AND UNDISSOLVED FORM

摘要

The present invention relates to at least one cathode-depositable binder (A1) for partially overcoating an electrically conductive substrate by electrophoretic dipping paint, wherein at least 30 ppm of Bi is present in dissolved form (A3) in (A) At least two biocides (A5) suitable for complexing Bi and Bi in a total amount of at least 130 ppm based on the total weight of (A), wherein at least 100 ppm of Bi is present in undissolved form in (A) Wherein (A5) is present in (A) in a proportion of not less than 5 mol% based on the total amount of Bi contained in (A) and the pH is in the range of 4.0 to 6.5. The present invention also relates to a process for the production of (A), the use of (A) for partially overcoating an electrically conductive substrate by means of electrophoretic dipping paint, the corresponding coating process, a partially overcoated substrate , And a method of setting and / or maintaining the concentration of component (A3) and / or (A4) in coating composition (A) during the coating method.