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Corrosion inhibition by polyaniline copolymer of mild steel in hydrochloric acid solution

Shi Fuhua (College of Chemistry, Chemical Engineering and Environment, Qingdao University, Qingdao, China and Institute of Multifunctional Materials, Laboratory of Fiber Materials and Modern Textile, Qingdao University, Qingdao, China)
Wang Xiutong (Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China)
Yu Jianqiang (College of Chemistry, Chemical Engineering and Environment, Qingdao University, Qingdao, China and Institute of Multifunctional Materials, Laboratory of Fiber Materials and Modern Textile, Qingdao University, Qingdao, China)
Hou Baorong (Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 24 May 2011

516

Abstract

Purpose

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The purpose of this paper is to evaluate the inhibitive effect of a polyaniline copolymer, namely, poly(aniline‐co‐o‐anthranilic acid) solution, on the corrosion of carbon steel in hydrochloric acid. The effect of the different concentrations of the corrosion inhibitor also was investigated.

Design/methodology/approach

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Fourier transform infrared spectroscopy was used to characterise the polyaniline copolymer. Weight loss measurements, potentiodynamic polarization and electrochemical impedance spectroscopy were carried out to determine the corrosion inhibition efficiency. Scanning electron microscopy was used to observe the morphology of the corroded surface.

Findings

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The results indicated that polyaniline copolymer solution acts as an effective corrosion inhibitor for carbon steel in hydrochloric acid solution and that the adsorption of the compound on the metal surface obeys the Langmuir adsorption isotherm.

Practical implications

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The corrosion inhibitor could have wide applications in the acid washing industry to reduce the corrosion rate of carbon steel in hydrochloric acid.

Originality/value

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This paper reveals a new type of corrosion inhibitor prepared from a polyaniline copolymer.

Keywords

Citation

Fuhua, S., Xiutong, W., Jianqiang, Y. and Baorong, H. (2011), "Corrosion inhibition by polyaniline copolymer of mild steel in hydrochloric acid solution", Anti-Corrosion Methods and Materials, Vol. 58 No. 3, pp. 111-115. https://doi.org/10.1108/00035591111130488

Publisher

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Emerald Group Publishing Limited

Copyright © 2011, Emerald Group Publishing Limited

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