Effects of Nano-SiO2 Particles on Rheological and Anticorrosion Properties of Automotive Electrocoats

Flow properties of an automotive electrocoat during curing process, plays an important role on its ultimate performances for instance anticorrosion properties. Appropriate additivesand/or pigments like organic flow modifiers, for example silicas and clays may help in this regards. Micro sized fillershave been utilized conventionally to enhance the rheological as well as anticorrosion properties of a coating. However, it has been shown that using such fillers may result in someunexpected disadvantages. Recently, it has been found that fillers on the nanometric scale, due to their high specificsurface area, could significantly influence rheological properties of a coating [1-3]. In this work, rheological as wellas anticorrosion properties of an automotive electrocoat filled by a hydrophilic nano-silica were studied.