讨论了线性极化电阻测量所遇到的困难,提出了一种微分极化电阻测量方法,并依据其原理研究制成一台微分极化电阻测试仪。用这种方法进行测量,不存在由于线性近似处理而引起的理论误差,也不存在测量频率、极化范围的选择问题。由于非法拉弟电流对测量结果的影响可以忽略,因而可以用较快的速度进行测量,能较好地实现腐蚀电位跟踪。对所提出的方法进行了实验验证,并与阳极线性极化电阻及双方向线性极化电阻测量结果进行了比较。
The difficulties encountered in Linear Polarization Resistance(LPR) measurements are discussed. A method for determining Differential Polarization Resistance(DPR) is proposed, Its principle is explained, and a DPR measuring device based on this principle is set up. By this technique, the theoretical errors arising from linearizing approximation in LPR measuring techniques will not exist, and other problems encountered in LPR measuring techniques such as how to choose measuring frequency and polarization value properly for a given corroding metallic electrode system will disappear. The effect of nonfaradaic current on results measured may be ignored by this measuring technique, so it is possible to perform the measurement rather rapidly and thus to trace the corrosion potential closely. The DPRs as measured by this technique have been compared with the theoretical PRs and LPRs obtained from polarization curves for Fe in 4 different solutions.
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