Method for the anodic electrophoretic enamelling and electrophoretic paints

Abstract

The invention relates to a method for the anodic electrophoretic enamelling of conductive surfaces by dipping into an aqueous anodic electrophoretic bath and by connecting as an anode. An aqueous anodic electrophoretic bath is used which contains 1 to 15 % by weight of one or more phosphoric acid epoxy esters and / or phosphonic acid epoxy esters in relation to the binding agent solid of the electrophoretic bath. Said phosphoric acid epoxy esters and / or phosphonic acid epoxy esters are produced in the presence of alcohols.

Description

technical field

[0001] The invention relates to a method of electro-dip coating which is particularly suitable for producing coating films with a desired mattness and improved edge protection and to an electrophoretic coating corresponding thereto. Electro-dip painting is a fully automated, environmentally friendly and economical method of painting and is therefore practically used for batch painting of conductive surfaces, especially metal surfaces. Electro-dip coating is a fully automated coating method with high coating efficiency. This process is preferably carried out in a closed cycle and allows the reuse of excess paint material as well as auxiliary substances and processing aids used. Background technique

[0002] In order to improve the corrosion resistance of the coating film, corrosion inhibiting pigments such as lead or chromium compounds, such as lead chromate, basic lead silicate or strontium chromate, are often added to electrophoretic paint. These compounds...