The influence of different weight on coated pigment by conductive polymer to anticorrosive properties of paint films applied on steel panels

摘要

This paper is focused on protection by organic coatings and paint films. The aim was comparing anticorrosion properties of coatings with different weight coated by conductive polymer on a silicate particles surface. Four types of barriers pigments were selected: Diatomite, Talc, Clay and Wollastonite in depend on their different particle shapes. These pigments were used as a substrate for preparing surface layer from salt of conductive polymer by oxopolymerization reaction. Polyaniline was chosen in his doped form - phosphate salt like a representative of conductive polymers. The synthesis of surface layer was made in two variant: 20 wt% and 30 wt% of that conductive polymer. For checking the layers were determined by DTA and for imagine analysis SEM. Prepared pigments were characterized by linseed oil consumption and density. The critical pigment volume concentration was calculated based on these data so in order to maximize and effective protection of metal. Organic coatings were dispersed in a ball mill and filtered. The homogenized binder/pigment systems contained the pigment at volume concentrations 1% and 10% including the layer of conductive polymer. Epoxy-ester resin was used as a binder with xylene as a solvent. The paints were applied to clean and degreased low steel carbon panels where the anticorrosion and physico-mechanical test were performed. The exposition of steel panels as samples in different types of corrosion atmospheres was a main test of this paper. The samples have been exposed for 1440 and 2160 hours in test chambers with humid atmosphere containing sulfur dioxide.