The effect of silica nanoparticles on the stability of waterborne epoxy emulsions and corrosion resistance of the coatings

The aim of this study was to investigate the effect of various amounts of silica nanoparticles addition onthe stability of waterborne epoxy emulsions containing 6 wt.% of an acrylate terpolymer latex (poly(methyl methacrylate-co-butyl acrylate-co-acrylic acid)) and 5 wt.% of a non-ionic emulsifier (nonylphenol ethoxylates 20 emulsifier (known as Kenon 20)) (EKA sample). In addition, the emulsions werecoated on steel substrates to examine the corrosion resistance of them. The results of the acceleratedstability test indicated that addition of 3 wt.% of the nanopaticles could enhance the stability of EKAemulsion from 20 to 27 days. Furthermore, the salt spray test revealed that the corrosion resistance wasimproved for the coatings with 3 wt.% of the nanoparticles.

Keywords:

Waterborne epoxy coating , Oil-water emulsion , Storage stability , Corrosion resistance