Electrochemical studies for the electroactivity of amine-capped aniline trimer on the anticorrosion effect of as-prepared polyimide coatings

The electroactive polyimide consisting of various content of amine-capped aniline trimers (ATs) have been successfully synthesized and characterized by Fourier-Transformation infrared and UV–visible absorption spectroscopy. The electroactivity of as-prepared polyimides was tested by electrochemical...

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Bibliographic Details
Published in:European polymer journal 2009-02, Vol.45 (2), p.485-493
Main Authors: Huang, Kuan-Yeh, Jhuo, Yu-Sian, Wu, Pei-Shan, Lin, Chieh-Hisen, Yu, Yuan-Hsiang, Yeh, Jui-Ming
Format: Article
Language:English
Subjects:
Amine-capped
Aniline trimer
Applied sciences
Corrosion
Corrosion prevention
Electroactivity
Exact sciences and technology
Metals. Metallurgy
Organic polymers
Physicochemistry of polymers
Polyimide
Polymers with particular properties
Preparation, kinetics, thermodynamics, mechanism and catalysts
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Summary:The electroactive polyimide consisting of various content of amine-capped aniline trimers (ATs) have been successfully synthesized and characterized by Fourier-Transformation infrared and UV–visible absorption spectroscopy. The electroactivity of as-prepared polyimides was tested by electrochemical cyclic voltammetry (CV) studies. It was noticed that the as-prepared electroactive polyimide with higher content of amine-capped ATs shows higher electroactivity (i.e., larger redox current) than that of non-electroactive polyimide, leading to enhance corrosion protection efficiency on cold-rolled steel (CRS) electrodes. This enhanced corrosion protection efficiency has been explained based on a series of electrochemical measurements such as corrosion potential, polarization resistance, corrosion current and electrochemical impedance spectroscopy (EIS) studies in 5 wt-% NaCl electrolyte. This significant enhancement of corrosion protection on CRS electrodes as compared to non-electroactive polyimide might probably be attributed to the redox catalytic property of as-prepared electroactive polyimide coatings inducing the formation of passive layer of metal oxide.
ISSN:0014-3057
1873-1945
DOI:10.1016/j.eurpolymj.2008.10.033