Phosphate-doped polyaniline/Al₂O₃ nanocomposite coating for protection of stainless steel

Abstract

Purpose

This work aims to prepare and characterize of protective anticorrosion phosphate-doped polyaniline (PANI) nanocomposite coatings for stainless steel (SS) in chloride solution.

Design/methodology/approach

PANI composite coatings were electrodeposited from aqueous sulfuric acid solution containing monomer and Al₂O₃ nanoparticles using cyclic voltammetry technique. Doping by phosphate was done by aging the coated steels for different periods (1–168 h) in phosphate solution. The polymer film composite was investigated by Fourier-transform infrared spectroscopy and scanning electron microscopy techniques. Potential-time, anodic polarization and electrochemical impedance spectroscopy were used to study the protection efficiency of the coatings.

Findings

The Al₂O₃ nanoparticles were incorporated into the deposited PANI layer but they decreased the deposition of polymer. The nanoparticles and the phosphate anions enhanced the protective PANI layer for passivation and protection of SS in the chloride solution.

Originality/value

The replacement of counter anions by phosphate ions improved significantly the PANI and its nanocomposite as protective coating of SS in chloride solution.

Citation

Hermas, A.-E.A., Wahdan, M.H. and Ahmed, E.M. (2020), "Phosphate-doped polyaniline/Al₂O₃ nanocomposite coating for protection of stainless steel", Anti-Corrosion Methods and Materials, Vol. 67 No. 5, pp. 491-499. https://doi.org/10.1108/ACMM-05-2020-2305