Synthesis and characteristics of alkyd resin/M-Porphyrins nanocomposite for corrosion protection application

In the present work, blends of M-Porphyrins (Zn-Pp, Cu-Pp, and Co-Pp) with alkyd resin have been used for development of novel nanocomposite anticorrosive coatings. The nanocomposite coatings containing the synthesized M-Porphyrins were applied on carbon steel specimens, and the coated specimens were evaluated for their corrosion and mechanical properties in 0.5 M HCl solution. The performance of nanocomposite coatings was detected using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), water permeability and pull-off adhesion measurements. Furthermore, scanning electron microscopy (SEM) analysis showed the surface characterizations of nanocomposite coatings. The coating film capacitances were monitored with the immersion time to establish water uptake of these coating films. The results showed that the incorporation of M-Porphyrins significantly improved anticorrosive performance and mechanical properties of the alkyd resin. Lower water uptake was observed for alkyd resin containing M-Porphyrins particles. The central metal atoms that were bonded to Porphyrins structure are the main reason for the difference in the protection efficiency. Best corrosion protection of the carbon steel was found for the alkyd resin with Co-Pp (98.47%).