Adhesion of hardened coating film on galvanizing steel

Abstract

On-site coating is applied on galvanized steel in order to improve the look and prevnet the surface corrosion, in the Japanese construction industry field. However, the coating film peeling is found here and there with time passage from the constrution in the present paint and coating tecnology. In this paper, coating method that uses modified epoxy resin type primer for undercoat is evaluated and analysed. The peeling mechanism is discussed based on above results. And then, coating method which uses different type of surface preparation and misture-hardenig type polyurethane primer is discussed.