Water-borne versus solvent-borne paints for protection of steel to atmospheric exposure

摘要

Water-borne anticorrosive paints are acquiring increasing relevance for the anticorrosive protection of steel surfaces exposed to the atmosphere, mostly due to the restrictions imposed by environmental and health protection agencies, However, some companies continue to be reluctant to use paints of this type to protect steel against atmospheric corrosion. Part of this reluctance may be attributed to low confidence, mainly due to a lack of knowledge of the performance of water-borne paint systems compared with traditional organic solvent-based paint systems. This paper presents results of experimental studies and includes technical considerations on the anticorrosive performance of paint systems using water-borne or solvent-borne paints when exposed to atmospheres with different degrees of corrsivity. On the basis of the practical results and the considerations presented in this paper, it may be stated that water-borne paint systems are currently available which present excellent anticorrosive behaviour, even in highly corrosive atmospheres. Copyright OCCA 2006.