Cathodic electrodeposition of epoxy resin system

Electrodeposition of paint has become one of the effective methods of application of coatings. It has several advantages over conventional paint application methods, the most important one being the control of pollution, since water is the main solvent used in the process in place of toxic organic solvents. Both anodic and cathodic processes have been developed, but the latter has clear cut advantages over the former, because, in cathodic process, the substrate dissolution can be avioded, which helps in eliminating the threat of coating discoloration and also the bath instability. Epoxy resins are well known for their corrosion protective properties. In the present work, water soluble epoxy resin is prepared by modifying with amine for getting cathode systems. The resin, on dissolution in water by adding organic acids, could be cathodically deposited. The studies made with the cathodic epoxy resin with and without pigmentation and also the evaluation of the electrocoating are detailed in this pape