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Studies of Polarization Resistance of Corroding Electrodes with a New Bridge-Like Instrument

机译：用新型电桥样仪研究腐蚀电极的极化电阻

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摘要

Experiments with a simple bridge for the determination of polarization resistance, electrode capacitance, and time constant of corroding electrodes are presented. The novelty is the use of low-frequency square waves (e.g., 10 mHz, 5 mV peak-to-peak) impressed on the specimens via capacitors in parallel with resistors. The instrumentation is very cheap and can be put together easily. The method is non-disturbing and reasonably fast. Data from eight different corroding systems have been compared with results from electrochemical impedance spectroscopy (EIS) and potentiokinetic sweep. The polarization current can alter performance of electrodes, so polarization resistance varied substantially with the type of measurements and the measuring parameters for seven out of the eight test cases. Therefore, the instrument was designed to handle modeling with two resistance-capacitance (RC) links in series. Since the lack of a well-defined polarization resistance is not easily observed with conventional methods with potentiostats and galvanostats, the bridge may have an advantage. The system with two RC links gives two sets of values for polarization resistance and electrode capacitance. The polarization resistance of the link with the shortest time constant can apply for nearly undisturbed, steady-state corrosion. In contrast to EIS are equivalent circuits with component values found by very simple calculations. The serious limitation is that many corroding systems (e.g., diffusion-limited electrode kinetics) cannot be modeled with RC circuits. [PUBLICATION ABSTRACT]
机译：提出了使用简单电桥确定极化电阻，电极电容和腐蚀电极时间常数的实验。新颖之处在于使用了低频方波（例如10 mHz，5 mV峰-峰值），该方波通过与电阻并联的电容器施加在样品上。该仪器非常便宜，可以很容易地组装在一起。该方法是无干扰的并且相当快。已将来自八个不同腐蚀系统的数据与电化学阻抗谱（EIS）和动电位扫描的结果进行了比较。极化电流会改变电极的性能，因此极化电阻会随测量类型和八个测试用例中有七个的测量参数而发生很大变化。因此，该仪器被设计为使用两个串联的电阻电容（RC）链接进行建模。由于使用恒电位仪和恒电流仪的常规方法不容易观察到缺乏明确的极化电阻，因此电桥可能具有优势。具有两个RC链接的系统给出两组极化电阻和电极电容值。具有最短时间常数的链接的极化电阻可适用于几乎不受干扰的稳态腐蚀。与EIS相反，等效电路具有通过非常简单的计算即可找到的元件值。严重的限制是许多腐蚀系统（例如，扩散受限的电极动力学）无法使用RC电路建模。 [出版物摘要]

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    《Corrosion》 |2011年第4期|p.1-10|共10页
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    K Videm;

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    K. Videm*Submitted for publication May 20, 2010: in revised form, September 8, 2010.[dagger] Corresponding author. E-mail: ketil.videm@kjemi.uio.no.* Institute for Chemistry, University of Oslo, Sem Saelands ? 26, N-0315 Oslo, Norway.;

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