Enhanced corrosion protective coating based on conducting polyaniline/zinc nanocomposite

Abstract

Conducting polyaniline (PANI) is being explored as promising material for protection of metals against corrosion. It has the possibility of making smart coatings on metals, which can prevent corrosion even in scratched areas where bare metal surface is exposed to the aggressive environment. However, PANI coatings have poor barrier and mechanical properties. The barrier property of coatings can be enhanced by the addition of appropriate filler particles. Also it has been demonstrated that nanoparticulate fillers give much better barrier properties even at lower concentrations. In this study, the effect of zinc nanoparticles on the anticorrosive property of PANI coating on iron samples has been investigated. The PANI/ Zn nanocomposite was synthesized by in situ polymerization of aniline in the presence of Zn nanoparticles. The nanocomposite was characterized by using FTIR, conductivity measurement, cyclic voltammetry, and AFM techniques. Results showed that PANI/Zn nanocomposite coating has improved corrosion protection effect when compared with pure PANI coating. The corrosion current of PANI/Zn coated samples were found to be much lower than that of pure PANI coated samples. The results were referred to the good barrier properties of Zn nanoparticles and improvement in electrochemical corrosion protection of PANI coating in the presence of Zn nanoparticles.

Characterization of ZnO/polyaniline nanocomposites prepared by using surfactant solutions as polymerization media

“…At the same time, cationic conducting polymers offer the combined advantages of biocompatibility12 and special affinity for DNA chains;13 amongst them, polyaniline (PANI) deserves special attention because of its distinct electrochromic behavior and electrochemical characteristics,14 and the fact that PANI samples prepared by facile and low‐cost processing methods15, 16 can attain high conductivity while maintaining a good environmental stability. Although several examples of hybrid structures of PANI and different inorganic nanoparticles17–20 can be found in the literature, no studies seem to have been directed so far to the preparation and characterization of water‐soluble ZnO_NPs/PANI composites. Also, although there are reports of preparation of pure PANI fibers by electrospinning in the literature,21, 22 to the best of our knowledge no previous report has been presented on the use of this method to obtain PANI/ZnO composite fibers.…”

Nanocomposite film formations of polyaniline via TiO2, Ag, and Zn, and their corrosion protection properties

“…The peaks at 1494 and 1531 cm −1 refer to the benzonoid and quinoid cycle of C C vibration frequencies, respectively. The peak at 1291 cm −1 refers to the C C strain, while the peak at 1077 cm −1 is attributed to C H bending vibration [31]. It can be concluded that combining PANI with TiO 2 , Ag and Zn nanoparticles enhance the protection properties of the electrocoating matrix.…”

A Review of Recent Developments in Coating Systems for Hot-Dip Galvanized Steel

“…Different kinds of metals, metal oxide particles, non-metallic particles, and nanomaterials can be encapsulated into polyaniline coatings. The introduction of zinc nanoparticles between polyaniline coatings could achieve improvements in conductivity and anticorrosion compared to zinc micro-sized particles (Olad and Rasouli, 2010). Moreover, nanoSiO 2 is one of the most promising nanoparticles applied into anticorrosive coatings.…”