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Preparation and anticorrosion properties of polyaniline‐containing coating on Mg‐Li alloy

Xing Juan Chen (College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin, China)
Cheng Luo (College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin, China)
Zheng Han Zhang (College of Electrical & Electronic Engineering, Harbin University of Science and Technology, Harbin, China)
Min Zhao (College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 2 November 2012

508

Abstract

Purpose

The purpose of this investigation was to synthesize a doped polyaniline‐containing coating and investigate the anti‐corrosion properties of the coating on Mg‐Li alloy.

Design/methodology/approach

The doped polyaniline pigments were prepared by two different methods using ammonium persulphate as oxidant and hydrochloric acid, phosphoric acid, p‐toluene sulfonic acid and sulfosalicylic acid as doping agents. The doped polyaniline was characterized by Fourier transform infrared (FT‐IR) analysis, X‐ray diffraction (XRD) and scanning electron microscopy (SEM). The coatings consisted of polyaniline, epoxy resin and other additives that were formed on Mg‐Li alloy. The anti‐corrosion properties of the polyaniline‐containing coating on the Mg‐Li alloy were investigated in 3.5 wt.% NaCl solution using open circuit potential logging and electrochemical impedance spectroscopy.

Findings

The results of the electrochemical tests indicated that the polyaniline‐containing coatings showed better anti‐corrosion properties, as compared to conventional epoxy coatings on Mg‐Li alloy when exposed in 3.5 wt.% NaCl solution. The coating containing 2 wt.% polyaniline (relative to the mass of epoxy resin) doped with hydrochloric acid had the best anti‐corrosion properties on the Mg‐Li alloy.

Originality/value

Previous reports on the anti‐corrosion properties of polyaniline‐containing coatings focused mainly on the surface of iron, steel, aluminum and magnesium, and there have been few studies on the anti‐corrosion properties as protective coatings for Mg‐Li alloy.

Keywords

Citation

Juan Chen, X., Luo, C., Han Zhang, Z. and Zhao, M. (2012), "Preparation and anticorrosion properties of polyaniline‐containing coating on Mg‐Li alloy", Anti-Corrosion Methods and Materials, Vol. 59 No. 6, pp. 291-298. https://doi.org/10.1108/00035591211274406

Publisher

:

Emerald Group Publishing Limited

Copyright © 2012, Emerald Group Publishing Limited

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