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A comparative study of corrosion resistance of epoxy-based coating incorporated chitosan, silica and hybrid compound of chitosan/silica on mild steel

Iling Aema Wonnie Ma (Centre for Ionics University of Malaya, Faculty of Science, Universiti Malaya, Kuala Lumpur, Malaysia)
Sachin Sharma Ashok Kumar (Centre for Ionics University of Malaya, Faculty of Science, Universiti Malaya, Kuala Lumpur, Malaysia)
Ramesh Kasi (Centre for Ionics University of Malaya, Faculty of Science, Universiti Malaya, Kuala Lumpur, Malaysia)
Ammar Shafaamri (Centre for Ionics University of Malaya, Faculty of Science, Universiti Malaya, Kuala Lumpur, Malaysia)
Ramesh Subramaniam (Centre for Ionics University of Malaya, Faculty of Science, Universiti Malaya, Kuala Lumpur, Malaysia)

Pigment & Resin Technology

ISSN: 0369-9420

Article publication date: 16 March 2022

66

Abstract

Purpose

This study aims to propose that the corrosion resistance of the neat epoxy coating can be further enhanced by incorporating reinforcing agents.

Design/methodology/approach

Chitosan, silica and their hybrid compound were used to study the subject of corrosion resistance of epoxy coating systems. This work used 3.5 Wt.% NaCl solution as the electrolyte, and electrochemical impedance spectroscopy (EIS) was used to investigate the electrochemical behaviour of the studied coating systems. Standard and accelerated states were used without and with scratch on the coating layer.

Findings

It was found that the impedance value of composite coating incorporated with the hybrid compound was significantly higher at 1010 Ω after 14 days of exposure in both testing states. The breakpoint frequency (fb) determination also proves with large capacitive region at low-to-high frequency of impedance plots corresponding to the high corrosion resistance.

Originality/value

The hybrid compound consisting of chitosan as organic biopolymer and silica as inorganic material, respectively, served as a promising reinforcing agent for composite coating as a promising corrosion inhibitor. Different states of EIS measurement were used which are standard (without scratch) and accelerated (with scratch) states associated with the fb values.

Keywords

Acknowledgements

The authors would like to thank Universiti Malaya for providing the IIRG grant (IIRG007C-19IISS) and SATU grant (ST031-2021).

Citation

Wonnie Ma, I.A., Kumar, S.S.A., Kasi, R., Shafaamri, A. and Subramaniam, R. (2022), "A comparative study of corrosion resistance of epoxy-based coating incorporated chitosan, silica and hybrid compound of chitosan/silica on mild steel", Pigment & Resin Technology, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/PRT-08-2021-0094

Publisher

:

Emerald Publishing Limited

Copyright © 2022, Emerald Publishing Limited

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