Comparison of Electrochemical Impedance and Noise Data for Polymer Coated Steel in the Frequency Domain
Comparison of Electrochemical Impedance and Noise Data for Polymer Coated Steel in the Frequency Domain
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聚合物涂层钢的电化学阻抗和噪声数据在频域中的比较
DOI：
10.4028/www.scientific.net/msf.289-292.93
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
G. Zhang
中科院分区：
文献类型：
--
作者：
F. Mansfeld;C.C. Lee;G. Zhang
使用电化学阻抗谱 (EIS) 和电化学噪声分析 (ENA) 监测暴露于天然 (NS) 和人工 (AS) 海水中的钢上不同聚合物涂层系统的降解情况。该项目的目的是确定微生物对暴露于 NS 期间钢上聚合物涂层保护性能退化的影响。海上试验地点是加利福尼亚州怀尼米港和佛罗里达州基韦斯特。已经开发出一种新方法，可以使用放置在远程测试站点的设备通过实验室的调制解调器获取电化学阻抗和噪声数据。同时确定电位和当前噪声数据。描述了实验方法，并提供了具有不同底漆和面漆组合的涂料体系暴露于 NS 和 AS 的代表性数据。电化学噪声数据在时域和频域进行了分析。以噪声阻抗图形式呈现的噪声数据与波特图中的阻抗谱进行了比较。在大多数情况下，在 ENA 可用的有限带宽中观察到使用两种不同技术获得的阻抗曲线之间具有极好的一致性。发现噪声电阻 R n 与频率无关，并且仅在与频率无关的噪声阻抗图上才等于极化电阻 R p。
The degradation of different polymer coating systems on steel exposed to natural (NS) and artificial (AS) seawater has been monitored using electrochemical impedance spectroscopy (EIS) and electrochemical noise analysis (ENA). The aim of this project is to determine the impact of microorganisms on degradation of the protective properties of polymer coatings on steel during exposure to NS. The marine test sites were Port Hueneme, California and Key West, Florida. A new approach has been developed to obtain electrochemical impedance and noise data via modem from the laboratory using equipment placed at the remote test sites. Potential and current noise data were determined simultaneously. The experimental approach is described and representative data from exposure to NS and AS are presented for coating systems with different combinations of primers and topcoats. Electrochemical noise data have been analyzed in the time and frequency domains. Noise data presented as noise impedance plots have been compared to impedance spectra in Bode plots. In most cases excellent agreement between the impedance curves obtained with the two different techniques has been observed in the limited bandwidth available for ENA. The noise resistance R n was found to be independent of frequency and equal to the polarization resistance R p only for frequency-independent noise impedance plots.