A Corrosion Monitor Based on Impedance Method
A Corrosion Monitor Based on Impedance Method
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一种基于阻抗法的腐蚀监测仪
DOI：
10.1520/stp28032s
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发表时间：
1981
期刊：
影响因子：
--
通讯作者：
T. Tsuru
中科院分区：
文献类型：
--
作者：
S. Haruyama;T. Tsuru
利用新型交流腐蚀监测仪，对腐蚀金属的阻抗特性进行了理论和实验研究。根据混合电位电极的阻抗理论，高频阻抗从低频阻抗减去，在大多数情况下，转移电阻很容易降低到电极的腐蚀率(如果对两个频率进行了适当的选择)。通过使用10 kHz和0.01 Hz两个交流电压的叠加信号，交流腐蚀监测仪被设计成在记录器上以对数刻度产生转移电阻或腐蚀电流。该监测仪允许在导电性较差的环境中测量腐蚀率，如自来水、蒸馏水和土壤。在大多数情况下，通过腐蚀电流的急剧增加也可以检测到局部腐蚀的开始。在腐蚀速率为15~0.0007 mm/年的各种环境下，交流腐蚀监测仪测量的腐蚀电流与失重法测得的腐蚀电流有很好的相关性。
Theoretical and experimental studies were performed on the impedance characteristics of corroding metal with the aid of a new a-c corrosion monitor. According to the theory of impedance of a mixed potential electrode, thesubtraction of the impedance at a high frequency from that at a low frequency yields, in most cases, transfer resistance that is readily reduced to the corrosion rate of the electrode (if an appropriate selection of the two frequencies has been made). By using a superimposed signal of two a-c voltages of 10 kHz and 0.01 Hz, the a-c corrosion monitor was designed to yield either transfer resistance or corrosion current on a recorder in logarithmic scale. The monitor permitted the measurement of the corrosion rate in less-conductive environments, such as tap water, distilled water, and soil. Initiation of localized corrosion was also detected in most cases by a sharp increase in corrosion current. The corrosion currents obtained with the a-c corrosion monitor and by the weight-loss measurement gave a good correlation on various metals under various environments, which cover corrosion rates of 15 to 0.0007 mm/year.