Epoxy linings for cathodic electro‐deposition paint tanks

Abstract

Summary A new technology for electropainting fabrications such as car bodies, by reversing the conventional polarity, was introduced into the U.K. market in 1979. It was claimed that the new method greatly increased the resistance to corrosive attack in service of such items, but the implementation of the acid paint system used was recognised as a potential source of failure for customary and proven electropaint tank linings used with the original basic protection primer. It was essential that a newly formulated resin tank lining was provided to meet the needs of major consumers of the new cathodic painting process and this dissertation outlines the method chosen and the constraints and risks which applied. A series of trial formulations were prepared incorporating the theory and practice of polymer technology for a new and novel development which would meet the challenge of a brand new technology. The high financial risk involved in possible failure together with the limited time available for assessment was weighted against the potential of a new market, and both commercial and technical requirements were satisfied by extending the theory of surface coating science into practice, through laboratory evaluation.