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首页> 外文期刊>Journal of new materials for electrochemical systems >Comparison between electrochemical noise and electrochemical frequency modulation measurements during pitting corrosion
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Comparison between electrochemical noise and electrochemical frequency modulation measurements during pitting corrosion

机译：点蚀过程中电化学噪声和电化学调频测量的比较

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摘要

The electrochemical noise (EN) and electrochemical frequency modulation (EFM) techniques have been compared for their use to detect pitting corrosion. To do this, experiments on different corroding systems showing passivation and pitting corrosion were carried out. These corroding systems were: (1) Aluminum in borate buffer solution with and without chlorides (pitting corrosion + passivation behavior), (2) AISI 304SS in 0.3 wt.% FeCl _3 solution and 6 wt.% FeCl _3 solution at room temperature (passivation behavior + pitting and/or crevice corrosion), and (3) AISI 304SS in 6 wt.% FeCl _3 at elevated temperature of 57 °C (pitting corrosion). Both EN and EFM were measured on-line meanwhile changing the corrosive environment by adding chlorides or by increasing the temperature. A potential perturbation composed of two sine waves is applied with the help of EFM to get current response at various frequencies. As the corrosion process is nonlinear in nature, the ac-response contains components at harmonic and intermodulation frequencies. Analysis of current components at different frequencies yields the information about the corrosion behavior under investigation. EFM may be considered to detect pitting initiation and its further development due to the results obtained by measuring the so-called "causality factors", which are the ratio of the current components in the ac-response.
机译：比较了电化学噪声（EN）和电化学频率调制（EFM）技术在检测点蚀中的用途。为此，对不同的腐蚀系统进行了显示钝化和点蚀的实验。这些腐蚀系统为：（1）含硼酸盐缓冲溶液中的铝，含或不含氯化物（点蚀+钝化行为）;（2）室温下在0.3 wt。％FeCl _3溶液和6 wt。％FeCl _3溶液中的AISI 304SS（钝化行为+点蚀和/或缝隙腐蚀），以及（3）在57°C的高温下于6 wt。％FeCl 3中的AISI 304SS（点蚀）。 EN和EFM都是在线测量的，同时通过添加氯化物或提高温度来改变腐蚀环境。在EFM的帮助下，施加了由两个正弦波组成的潜在扰动，以获取各种频率下的电流响应。由于腐蚀过程本质上是非线性的，因此交流响应包含谐波和互调频率的分量。分析不同频率下的电流成分可得出有关所研究腐蚀行为的信息。由于通过测量所谓的“因果因数”获得的结果，EFM可以被认为是检测点蚀的开始及其进一步发展，该因果关系是响应中电流分量的比率。

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