本文研究了采用护环电极（Guard Ring Electrode, GRE, GE）测量方法，探讨辅助电极CE、护环电极GE在钢筋极化过程中的电流分配比，以及护环电极补偿电流的大小对正确测量研究区域内的钢筋极化电阻Rp的影响。发现为获得较准确的极化电阻Rp值，即要将极化电流限制在辅助电极CE的投影面积上，仅仅考虑到二维表面的电流（电位差）补偿是不够的，对于高阻混凝土(钝态钢筋)体系，简单的表面电流补偿导致测量的Rp值偏小，只有考虑到混凝土结构中三维空间的电流补偿，才可能得到正确的Rp值。实验中将测量结果与均匀极化测量结果进行了对比，表明，对于活化态的钢筋混凝土体系，采用护环电极能够较好地将极化电流限制在工作区域内，从而可对钢筋混凝土体系进行准确的腐蚀测量。
In this paper Guard Ring Electrode was applied to study corrosion behavior of rebars in concrete. The current ratio of Counter Electrode (CE) and Guard Ring Electrode(GE) had been discussed during rebars were polarized. Furthermore, we discussed the effect of GE current for the sake of obtaining accurate polarization resistance Rp value. In order to achieve real Rp value, CE current must be confined in the projection rebar area below CE. During the experiment, the potential difference of concrete surface was monitored at the same time. However, it is insufficient considering only two-dimension current distribution. Generally very high concrete resistance tends to result in small measuring Rp value because of the over compensation of CE current. In order to obtain real Rp value, three-dimension other than two-dimension current distribution must be considered. Compared with uniform polarization result, it can be seen when rebars was active, CE polarization current could be confined preferably in the constant rebars area below CE by GEM, indicating the GEM could be used to monitor the corrosion behavior of rebars in concrete more accurately than other custom LPR method.
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