Dip-coating composition for electroconductive substrates, comprising a sol-gel composition

An aqueous coating composition comprising

• (A) at least one aqueous dispersion or solution of at least one electrophoretically depositable binder and optionally of at least one crosslinking agent, and
• (B) at least one aqueous sol-gel composition,
• for at least partly coating an electrically conductive substrate with an electrocoat material,
• the electrophoretically depositable binder being cathodically depositable and being a polymeric resin which has reactive functional groups which permit a crosslinking reaction with the crosslinking agent optionally present, and
• the aqueous sol-gel composition (B) being obtained by reaction of at least one starting compound suitable for preparing the sol-gel composition (B) with water, with hydrolysis and condensation of the at least one starting compound,
• the at least one starting compound having at least one metal atom and/or semimetal atom and at least two hydrolyzable groups, and at least one nonhydrolyzable organic radical,
• wherein the aqueous sol-gel composition (B) has at least two different non-hydrolyzable organic radicals, where one of these radicals is a C1-C10 aliphatic radical which has at least one hydroxyl group as at least one reactive functional group, and the remaining nonhydrolyzable organic radical is a C1-C10 aliphatic radical which has at least one primary amino group or at least one secondary amino group as at least one reactive functional group.

A method for at least partly coating an electrically conductive substrate with an electrocoat material, comprising

• (b1) at least partly coating the substrate with an aqueous coating composition at least partial electrophoretic deposition, wherein the aqueous coating composition comprises
• (A) at least one aqueous dispersion or solution of at least one electrophoretically depositable binder and optionally of at least one crosslinking agent, and
• (B) at least one aqueous sol-gel composition,
• the electrophoretically depositable binder being cathodically depositable and being a polymeric resin which has reactive functional groups which permit a crosslinking reaction with the crosslinking agent optionally present, and
• the aqueous sol-gel composition (B) being obtained by reaction of at least one starting compound suitable for preparing the sol-gel composition (B) with water, with hydrolysis and condensation of the at least one starting compound,
• the at least one starting compound having at least one metal atom and/or semimetal atom and at least two hydrolyzable groups, and at least one nonhydrolyzable organic radical.