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首页> 外文会议>Corrosion conference and expo >Using Local Electrochemical Impedance Spectroscopy to Detect Coating Defects on Buried Pipelines
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Using Local Electrochemical Impedance Spectroscopy to Detect Coating Defects on Buried Pipelines

机译：使用局部电化学阻抗谱检测地下管道的涂层缺陷

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Local electrochemical impedance spectroscopy (LEIS) has been used to determine the micro- and macroscopic defect sites on coated coupons in a laboratory-scale setup. LEIS is conducted by applying a sinusoidal potential signal to a working electrode and then measuring the response of a particular location by placing two reference electrodes in the electrolyte above that location. Scale-up issues need to be resolved if LEIS is to be used for inspecting and identifying coating defects on the buried pipeline. The parameters such as the distance of the two-electrode system from the pipeline surface, distance between the two electrodes, and frequency of the applied excitation signal are important factors that need careful selection. These parameters are determined by conducting the numerical simulations of cathodic protection and LEIS models and conducting field experiments. A bielectrode probe, consisting of two reference electrodes, was developed for field experiments. Field experiments were conducted on a buried pipeline with several coating defects. The collected data were used to calculate local electrochemical impedance spectra of different test sites on the pipeline. The calculated local impedances indicate that the method is capable of identifying coating defect locations on buried pipelines.
机译：局部电化学阻抗谱（LEIS）已用于确定实验室规模设置中涂层试样上的微观和宏观缺陷部位。通过将正弦电位信号施加到工作电极上，然后通过将两个参比电极放置在该位置上方的电解质中来测量特定位置的响应来进行LEIS。如果将LEIS用于检查和识别埋地​​管道上的涂层缺陷，则需要解决放大问题。诸如两电极系统到管道表面的距离，两个电极之间的距离以及所施加的激励信号的频率等参数是需要仔细选择的重要因素。这些参数是通过进行阴极保护和LEIS模型的数值模拟以及进行现场实验确定的。开发了由两个参比电极组成的双电极探针，用于野外实验。在具有多个涂层缺陷的地下管道上进行了现场试验。收集的数据用于计算管道上不同测试位置的局部电化学阻抗谱。计算出的局部阻抗表明该方法能够识别埋在地下管道上的涂层缺陷位置。

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