Zinc pigments and waterborne paint resins

Abstract

Zinc pigments corrode in aqueous alkaline paint media (e.g., waterborne anticorrosive paints) with the evolution of hydrogen. Paint resins inhibit this corrosion reaction at a pH value of 8 more effectively than at pH10. An increase of resin addition effects a decrease of hydrogen evolution (i.e., corrosion inhibition increases). The corrosion reaction of spherical zinc dust can be nearly completely inhibited with the addition of a certain epoxy ester resin (EPE 1). The epoxy ester resin looses its corrosion inhibiting properties after film formation, because of loosing its mobility, which seems to a be requirement for corrosion inhibition. So, zinc dust is inhibited in the liquid waterborne paint but still shows its sacrificial action in the solid primer coating.

Citation

Müller, B. (2001), "Zinc pigments and waterborne paint resins", Pigment & Resin Technology, Vol. 30 No. 6, pp. 357-362. https://doi.org/10.1108/03699420110410307