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- 作者：Bruce L. Hall ; Mitzi Hirbe ; Brian Waterman ; Sarah Boslaugh ; William Claiborne Dunagan
- 关键词：Iron ; AOT ; Electrodeposited polypyrrole ; Electrochemical impedance spectroscopy
- 刊名：Journal of the American College of Surgeons
- 出版年：2008
- 出版时间：June 2008
- 年：2008
- 卷：206
- 期：6
- 页码：1242-1245
- 全文大小：67 K
文摘
The electrosynthesis of polypyrrole (PPy) onto iron electrodes in the presence of sodium bis(2-ethylhexyl) sulfosuccinate (AOT) solutions is characterized by the formation of a gelatinous material in parallel to the growth of the polymer. The electrochemical behaviour of this system under different experimental conditions was investigated using electrochemical impedance spectroscopy (EIS) and cyclic voltammetry. The study was focused in understanding the effects of various parameters, such as nature of the electrolyte and film thickness, on the dissolution process of iron. The response at low frequencies is related with the activity of the substrate. It was found that the electrode impedance for thick films is governed by diffusion of iron ions across the polymer and gel-like layers. Mass transfer contribution is prominent at the early stages of corrosion in chloride solution.