期刊
PIGMENT & RESIN TECHNOLOGY
卷 -, 期 -, 页码 -出版社
EMERALD GROUP PUBLISHING LTD
DOI: 10.1108/PRT-08-2021-0094
关键词
Hybrid chitosan; silica; Electrochemical impedance; Corrosion resistance; Composite coating; Breakpoint frequency
资金
- Universiti Malaya [IIRG007C-19IISS]
- SATU grant [ST031-2021]
This study proposes that the corrosion resistance of neat epoxy coating can be improved by incorporating reinforcing agents. Chitosan, silica, and their hybrid compound were used to investigate the corrosion resistance of epoxy coating systems. The study found that the composite coating with the hybrid compound showed significantly higher impedance values and corrosion resistance in both testing states.
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 10(10) omega after 14 days of exposure in both testing states. The breakpoint frequency (f(b)) 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 f(b) values.
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