(185h) Conducting Polymer-Based Nanocomposite Anti-Corrosion Coatings for the Protection of Metals

Conducting polymers like polyaniline inhibit the corrosion of metals by a variety of mechanisms. Corrosion inhibition of mild steel and stainless steel was evaluated using potential profiling (OCP), potentiodynamic polarization (Tafel plots), and electrochemical impedance spectroscopy (EIS). Performance is enhanced when polyaniline is synthesized as a composite with nano-structured titanium dioxide. Further enhancements are observed when the titanium dioxide nanoparticles are doped with transition metal ions. Poly-2-ethoxyaniline behaves similar to parent polyaniline against steels but show markedly improved performance against Cu. A novel method to solubilize doped poly-2-ethoxyaniline in aqueous solvents is described.