Sustainable Resource Based Nanostructured Corrosion Protective Smart Coatings

摘要

performance corrosion resistant coatings having a broad spectrum of effectivity under a wider range of hostile environments. The replacement of toxic inhibitors such as chromates and phosphates with nanostructured conducting polymers is one of the best alternatives to design ecofriendly smart corrosion protective coatings with self-cleaning properties, discoloration resistance, and high scratch as well as wear resistance properties. The formulation of such coating systems is expected to cause a major revolution in the corrosion world. Moreover, emphasis is also being laid on the production and processing of polymers from renewable resources which show advantages when compared with petrochemical raw materials. The present study highlights the corrosion protective behavior of com-posites of nanostructured poly(1-napththylamine) (PNA) dispersed linseed oil polyurethane amide (LPUA) coatings. The combination of the electrically conducting nanostructured PNA with the LPUA was accomplished through different weight percent loadings (0.5-3.0 wt%) of the conducting poly-mer. The particle size of the nanocomposite was determined by transmission electron microscopy (TEM) and was found at 17-27 nm. The PNA/LPUA composite coatings were found to effectively pas-sivate mild steel (MS) in acid, alkaline as well as saline corrosive media, which was confirmed by open circuit potential measurements and corrosion rate studies. The present method of formulation of anticorrosive coatings using oil based polymer matrix is economically feasible, as a variety of oil based polymer matrices can be used to tailor such coatings systems that are ecologically safe and exhibit superior corrosion protective properties as compared to the existing commercial formulations.