Epoxy Polyaniline–SBA15/Fluconazole Hybrid Nanocomposite Coatings: As a Self-Healing Corrosion Protection of Mild Steel

Tuesday, 7 October 2014
Expo Center, 1st Floor, Center and Right Foyers (Moon Palace Resort)
V. B. Terrones (Universidad Autónoma del Estado de Morelos, CIICAp), J. Uruchurtu (CIICAp), M. A. R. Romo (Universidad Autónoma Metropolitana, Campus Azcapotzalco), C. Menchaca (Universidad Autonoma del Estado de Morelos), and M. J. Esparsa (Universidad Autónoma Metropolitana, Campus Iztapalapa)
The objective of this research is the production of an epoxy coating blended with organic–inorganic hybrid nanocomposite applied over mild steel, as a self-healing corrosion protection of defects.

 A  series of conducting polyaniline (PANI)–SBA15/Fluconazole nanocomposites materials are being prepared by an in situ chemical oxidative method of aniline monomers in the presence of SBA15/fluconazole complex nanorods which were  synthesized previously with camphor-sulfonic acid (CSA) and ammonium peroxydisulfate (APS) as surfactant and initiator, respectively. A commercial epoxy coating was applied over samples afterwards.

The synthesized materials were characterized by X-ray diffraction pattern (XRD), Fourier transform infrared (FTIR), scanning electron microscopy (SEM).

To determine the best inhibitor concentration, the anti-corrosion behavior of the Fluconazole  was studied in a ammonium sulfide-sodium chloride pH 7 solution, at a temperature of 25  ͦ C using electro-chemical techniques including electrochemical impedance spectroscopy (EIS) and polarization potentiodynamic. The electrochemical results show that this inhibitor has an effect on anodic region forming a passivation layer, and the best result was achieved with 150 ppm of Fluconazole.

The next step was to prepare the SBA15/Fluconazole nanorods, and finally the PANI-SBA15/Fluconazole composite, and evaluate the self-healing effect over mild steel.

It was found that the presence of SBA15/Fluconazole nanorods dispersed in the PANI matrix can significantly improve the corrosion protection and barrier effect performance of the epoxy coating due to the flaky shaped structure of the PANI–SBA15/Fluconazole nanocomposites, evaluated electrochemically.