PROPERTIES OF ORGANIC COATINGS CONTAINING PIGMENTS WITH SURFACE MODIFIED WITH A LAYER OF ZnFe2O4

Abstract

This work is focussed on the properties of organic coatings containingpigments whose surface was chemically coated with zinc ferrite (ZnFe2O4)layer. Four silicate types with different particle shapes were selectedas the cores: diatomite, talc, kaolin and wollastonite. The untreatedparticles exhibit a barrier effect. The aim of this project was to applythe surface treatment approach with a view to enhancing not only themodel paint films' anticorrosion properties but also their resistance tophysico-mechanical tests pursuant to ISO standards (cupping, bending,impact, adhesion). Other parameters examined included: particle size andmorphology, density of the modified pigment, oil consumption, pH,conductivity, and electrochemical properties of the paint film. Asolvent-based epoxy-ester resin was used as the binder and also servedas the reference material. The pigment volume concentration (PVC) was1% and 10%. During the last stage of the experiment, the paint filmswere exposed to a corrosive environment stimulating seaside conditionsor conditions roads treated with rock salt. The accelerated cycliccorrosion test in a neutral salt mist atmosphere was conducted for 864hours. The results served to ascertain a suitable environment fororganic coatings.