Electrical conducting Xanthan Gum-graft-polyaniline as corrosion inhibitor for aluminum in hydrochloric acid environment

The work reports the preparation and characterization of Polyaniline (PANI) grafted on Xanthan Gum (XG) backbone as a conducting biopolymer. The grafting has been achieved by polymerization of aniline under acidic conditions employing microwave radiation. The formation of the graft copolymer has been confirmed by FTIR, UV-Vis and TGA data. The DC conductivity measurements indicated enhancement in conductivity of XG on grafting with PANI. The corrosion inhibitor property of XG and XG-g-PANI in aggressive acid environment was checked on aluminum surface by weight loss, potentiodynamic polarization, AC impedance and surface studies. Both the samples are found to be potential inhibitors, the effect being significantly higher for the grafted sample. (C) 2017 Elsevier B.V. All rights reserved.