New Azo Dyes-Based Mg Complex Pigments for Optimizing the Anti-Corrosion Efficiency of Zinc-Pigmented Epoxy Ester Organic Coatings

This work addresses the possibilities of using synthesized novel magnesium complex dyes in zinc pigmented organic coatings based on epoxyester resin to reduce content these while maintaining or increasing anticorrosive efficiency them. The complexes Mg-Dye-I (C34H26MgN8O6), Mg-Dye-II (C26H19MgN3O5), Mg-Dye-III (C17H10MgN2O3), and Mg-Dye-IV (C25H18MgN4O6) with a series azo carboxylate ligands were prepared from diazo-coupling reaction anthranilic acid 5-methyl-2-phenyl-3-pyrazolone (Dye I; C17H14N4O3), naphthol AS-PH II; C26H21N3O5), 2-naphthol III; C17H12N2O3), 2-amino-5-nitrophenol IV; C25H20N4O6). characterized by analytical methods. Model containing at pigment volume concentrations (PVCs) = 1, 3, 5 10% ratio concentration/critical concentration (PVC/CPVC) 0.60 formulated study inhibitory properties individual dyes. inorganic pigments (MgO Ca-Mg-HPO4) PVCs 1%, 3%, 5% PVC/CPVC also formulated. coating only was as standard coating. Corrosion resistance evaluated potentiodynamic polarization studies electrochemical impedance spectroscopy. tested other standardized derived corrosion tests. In addition, mechanical studied determined aim verify possible synergistic improving mechanical, anti-corrosion, chemical coatings.