Novel, Water-based High-Performance Primers that can Replace Metal Pretreatments and Chromate-Containing Primers

摘要

In previous research it has been demonstrated that simple rinses with organofunctional silanes can be used to protect metals against various forms of corrosion. Such treatments also improve paint adhesion. However, when unpainted, the silane films are too thin to provide long-term corrosion protection. In this paper we will show that much thicker primer-like coatings can be obtained from silanes if they are mixed with organic resins and small particles, preferably of nanosize. Self-priming coatings of up to 20 mu m thickness have been obtained with outstanding adhesion and corrosion protection properties. The components of such 'superprimer' systems are all water-based and do not contain chromates or other toxic ingredients. Thus, they are environmentally friendly. In this paper several successful superprimers are described and performance data are presented.