Electropolymerization of poly(aniline-co-p-toluidine) on copper and its application as a corrosion inhibitor

Abstract

Purpose

This paper aims to compare the inhibitive effects of polyaniline (PAni), poly(p-toluidine) and poly(aniline-co-p-toluidine) in hydrochloric acid (HCl) solution.

Design/methodology/approach

The electrochemical deposition of PAni, poly(p-toluidine) and poly(aniline-co-p-toluidine) on pure copper metal was studied potentiodynamically. The copolymer deposited was characterized by Fourier transform infrared (FTIR) spectroscopy, ultraviolet (UV)-visible spectroscopy and scanning electron microscopy (SEM). The corrosion inhibition studies on copper electrode were performed using electrochemical methods, viz, open circuit potential (OCP) measurements, potentiodynamic polarization scans and electrochemical impedance spectroscopy (EIS) tests, conducted in 0.1 M HCl solution.

Finding

The results of the study reveal that the copolymer of poly(aniline-co-p-toluidine) at the optimum concentration of 1 × 10−3 M has better corrosion inhibition efficiency as compared to PAni and poly(p-toluidine).

Research limitations/implications

The conducting polymers are difficult to deposit on the metal surface because of their high dissolution tendency before the electropolymerization potential of the monomer is achieved.

Practical implications

From an environmental viewpoint, poly(aniline-co-p-toluidine) is a toxic and hazardous conducting polymer.

Originality/value

The paper demonstrates that poly(aniline-co-p-toluidine) showed better dispersion in different organic solvents and had higher corrosion inhibition efficiency than PAni.

Citation

Rashid, M., Sabir, S., Waware, U. and A. Rahim, A. (2014), "Electropolymerization of poly(aniline-co-p-toluidine) on copper and its application as a corrosion inhibitor", Anti-Corrosion Methods and Materials, Vol. 61 No. 5, pp. 334-342. https://doi.org/10.1108/ACMM-06-2013-1274