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首页> 外文期刊>NDT & E international >Linear polatisation resistance measurements using a potentiostatically controlled guard ring
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Linear polatisation resistance measurements using a potentiostatically controlled guard ring

机译：使用恒电位控制保护环测量线性抗极化能力

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摘要

The use of a sensor controlled guard ring has been developed in recent years to enhance the accuracy of linear polarisation corrosion rate measurements on reinforced concrete structures. The established method of measurement uses a galvanostatically controlled guard ring device. In the method reported in this article the reinforcing steel is polarised potentiostatically by an inner auxiliary electrode and the real time plot of the current response is displayed on a laptop computer which controls the guard ring device. The area of steel polarised is confined by a current applied from an outer guard ring electrode which is controlled by two sensor electrodes positioned between the inner auxiliary and outer guard ring electrode. The potential between the two sensor electrodes is continually monitored, and the current output from the guard ring electrode varied to maintain a constant potential difference between the two sensor electrodes. The method has been validated on an electrical test circuit simulating active and passive reinforcement corrosion. Further testing has been conducted on a reinforced concrete specimen and the results compared with those of commercially available galvanostatically controlled equipment and those of standard unconfined linear polarisation resistance measurements.
机译：近年来，已开发出使用传感器控制的保护环，以提高钢筋混凝土结构上线性极化腐蚀速率的测量精度。既定的测量方法使用恒电流控制的保护环装置。在本文报道的方法中，钢筋通过内部辅助电极被恒电位极化，并且电流响应的实时曲线图显示在控制护环装置的便携式计算机上。极化的钢区域由外部保护环电极施加的电流限制，该电流由位于内部辅助保护环电极和外部保护环电极之间的两个传感器电极控制。连续监视两个传感器电极之间的电势，并改变从保护环电极输出的电流，以在两个传感器电极之间保持恒定的电势差。该方法已在模拟主动和被动钢筋腐蚀的电气测试电路上得到验证。已对钢筋混凝土试样进行了进一步测试，并将结果与​​市售的恒电流控制设备的结果以及标准无极限线性极化电阻的测量结果进行了比较。

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