Enhancement of anticorrosion performance on aluminium substrate by novel nanocomposites of PANI/Bi2O3.CO.ZnO/CNT

Abstract

PANI/Bi₂O₃.CO.ZnO nanocomposites were prepared in presence of bismuth cobalt oxide nanoparticles at 25^oC using ammonium persulphate as an oxidant in an in situ polymerisation with aqueous solution of camphor sulphonic acid (SDBS). These nanocomposites were characterized by XRD, FTIR, TEM, UV and SEM. The performance of PANI, PANI/Bi₂O₃.CO.ZnO nanocomposites and PANI/Bi₂O₃.CO.ZnO/CNT nanocomposites as anticorrosion protective coating on Al in 0.5 M HNO₃ was studied by using potentiodynamic polymerisation technique and electrochemical impedance spectroscopy (EIS). These studies showed a good corrosion inhibition of aluminium in 0.5M HNO₃ by the fabricated nanocomposites. PANI/Bi₂O₃.CO.ZnO/CNT shows the best corrosion inhibition and obtained 99.85% corrosion inhibition efficiency.

Keywords: Polyaniline; EIS; Nanocomposites; Corrosion inhibitor; Potentiodynamic polymerisation technique.