| Autor: |
Mei-Hui Tsai, Tzu-Chun Yeh, Hsiu-Ying Huang, Wei-Fu Ji, Wei-I Hung, Tsao-Cheng Huang, Yi-Chen Chou, Jui-Ming Yeh |
| Rok vydání: |
2011 |
| Předmět: |
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| Zdroj: |
Electrochimica Acta. 56:10151-10158 |
| ISSN: |
0013-4686 |
| DOI: |
10.1016/j.electacta.2011.08.114 |
| Popis: |
In this study, electrochemical investigations of corrosion protection and the electrochromic properties of an aniline-pentamer-based electroactive polyimide (AP-based EPI) coating prepared by oxidative coupling polymerization are presented. The in situ chemical oxidation of the reduced form of soluble, electroactive poly(amic acid) (EPAA) in N -methyl-2-pyrrolidone (NMP) was monitored by UV–Vis absorption spectra. Moreover, the electroactivity of the AP-based EPI was evaluated by performing electrochemical CV studies. Based on a series of electrochemical measurements in 3.5 wt% NaCl electrolyte, the AP-based EPI coating was found to exhibit enhanced corrosion protection effects on cold-rolled steel (CRS) electrodes as compared to the corresponding non-electroactive (NEPI) coating. A possible mechanism for the enhanced corrosion protection of EPI coatings on the CRS electrode has been proposed as follows: (1) EPI coatings may act as a physical barrier and (2) the redox catalytic properties of the aniline pentamer units in EPI may induce the formation of a passive metal oxide layer on the CRS electrode, as evidenced by SEM and ESCA studies. The electrochromic performance of EPI was investigated by measuring electrochromic photographs and UV absorption spectra. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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