Electrochemical studies for the electroactivity of amine-capped aniline trimer on the anticorrosion effect of as-prepared polyimide coatings |
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Authors: | Kuan-Yeh Huang Pei-Shan Wu Yuan-Hsiang Yu |
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Affiliation: | a Department of Chemistry and Center for Nanotechnology at CYCU, Chung-Yuan Christian University, No. 200, Chung-Pei Road, Chung Li 32023, Taiwan, ROC b Department of Electronic Engineering, Lan-Yan Institute of Technology, I-Lan 261, Taiwan, ROC |
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Abstract: | 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. |
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Keywords: | Amine-capped Aniline trimer Electroactivity Polyimide Corrosion |
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