Evaluation of Polymer Nano Pigments Performance as Corrosion Inhibitor

Conducting polymers gained much attention during the past two decades because of their environmentally friendly behavior as well as their unusual corrosion inhibiting action for metals. Among these conducting polymers, polyaniline is considered to be one of the best anticorrosive materials not only because of its unique redox tunability, environmental stability and simple acid–base doping–dedoping process, but also because passivation of oxide layer between metal and coating is induced by PANI, which protects the metal from further corrosive attack.[1] It should be noted that obtaining a long corrosion protection using organic coatings without reinforcing it by other inhibiting materials seems impossible. Nanopigments doped with inhibitive species like Zn, Ni, Co and Mn has been considered as route for obtaining inhibitive performance. These nanopigments release inhibitive species like Co2+, Mn2+ and Ni2+ cations in the scratched area and protect it from corrosion through precipitating a passive film on the bare metal surface.[2]