Effect of nano-pigments on the corrosion resistance of epoxy coatings
In a work, researchers have combined the desirable colour characteristics of cationic dyes and the good barrier properties of organoclays by synthesising hybrid dye-clay nano-pigments.
The synthesis took place via cationic exchange of two cationic dyes (i.e. basic blue 9 and basic yellow 87) and commercial organoclays (Cloisite 15A, 20A and 30B). Then, different amounts of hybrid dye-clay nano-pigments (DCNPs) were incorporated in an epoxy coating and their corrosion resistance behaviours were investigate.
Superior corrosion resistance
Results showed that the extent of intercalation/exfoliation of DCNPs was greater than that of organoclays. Moreover, it was found that DCNPs based on Cloisite 20A had the best dispersion properties among different nanoclays. It was revealed that the corrosion resistance of coatings containing DCNPs (based on Cloisite 20A) was superior in comparison to coatings containing only Cloisite 20A. Finally, results demonstrated the technical feasibility of preparation of colored epoxy coatings with superior corrosion resistance by the incorporation of DCNPs (in the range of 1–5 wt.%) into epoxy matrix.
The study is published in: Progress in Organic Coatings, Volume 114, January 2018.
