study on synthesis of doped polyaniline with alumina and its anticorrosion properties as an additive in paint coating

In this study, polyaniline nanocomposite with aluminum oxide (pani/al2o3) was synthesized in situ polymerization method and the anti-corrosion ability of nanocomposite was investigated. products were identified by chemical analysis of fourier transform infrared (ft-ir) spectroscopy, x-ray crystallography (xrd), and thermal weighing calorimetric analysis (tga). also, anti-corrosion properties were analyzed by open circuit potential (ocp)analysis, electrochemical impedance spectroscopy (eis), and potentiodynamic polarization curves. to investigate anti-corrosion performance, different percentages of nanocomposites (3, 6, 9, and 12 %) were added to industrial paint and applied to steel sheets as a coating. the results of corrosion performance illustrated that the steel sheets coated with pani/al2o3 nanocomposites along with the paint, have less corrosion compared to the samples of pure steel sheets and the cases coated with pani/al2o3 nanocomposites. also, the 6 % coating containing pani/al2o3 nanocomposite along with paint on steel sheets showed the best anti-corrosion properties. the open-circuit potential analysis results make it clear that the coatings containing pani/al2o3 nanocomposite with paint have a higher performance compared to pure paint coatings in 3 wt% nacl solution. eis analysis revealed resistance of the coating containing 6 % pani/al2o3 along with the paint is more than other samples in 3 % nacl solution.