Co‐dispersion and co‐deposition of pigments and binders in electropainting

During the 1960s, a new paint application process began to appear, variously called “Electro‐coating”, “Electropainting”, “Electrophoretic deposition”, etc. The process extends and modifies the principles of electroplating into the field of electro‐deposition of paint. It is best characterised as the utilisation of Electrodepositable Synthetic Filmforming Macro‐ions. The process, like electroplating, consists in submerging objects to be coated in a bath of waterdispersed ions. These, through the action of an impressed DC current, are deposited on the electrode of opposite polarity. While metal ions require 1 Faraday for the deposition of approximately 30g metal, electrocoating of paints requires 1 Faraday for typically 1,600g of paint.