Modeling of the cast iron/drinking water system by electrochemical impedance spectroscopy
Modeling of the cast iron/drinking water system by electrochemical impedance spectroscopy
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DOI：
10.1016/s0013-4686(99)00150-4
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发表时间：
1999-01-01
影响因子：
6.6
通讯作者：
Tribollet, B
中科院分区：
文献类型：
--
作者：
Frateur, I;Deslouis, C;Tribollet, B
在饮用水管网游离氯消耗的各种原因中，管道的内部腐蚀迄今为止尚未得到认真考虑。这项工作的重点是通过电化学阻抗谱和经典摄影观察对铸铁（作为这些网络的代表性材料）在非氯化和氯化水中的腐蚀研究。用铸铁旋转盘电极收集的结果表明，铸铁的行为仅取决于游离氯的存在或不存在，而不取决于其浓度。此外，他们基于 de Levie 的多孔电极理论得出了不同腐蚀产物层的方案。该物理模型描述了铸铁在有和没有游离氯的情况下以及在任何浸泡时间下的行为。首先用Orazem等人开发的测量模型对实验阻抗图进行拟合，以识别随机误差并删除非平稳点。然后，物理模型对数据的回归提供了阳极电荷转移电阻的值，从而提供了腐蚀电流的值。由于发现阳极电荷转移电阻与极化电阻具有相同的数量级，因此可以使用比电化学阻抗更简单的技术来评估腐蚀速率。 (C) 1999 Elsevier Science Ltd. 保留所有权利。
Among the various causes of free chlorine consumption in drinking water distribution networks, the internal corrosion of pipes has not been so far seriously considered. This work focused on the corrosion study of cast iron, as a representative material of those networks, in non-chlorinated and chlorinated waters, by both electrochemical impedance spectroscopy and classical photographic observations. The results collected with cast iron rotating disk electrodes show that the behavior of cast iron depends only on the presence or absence of free chlorine and not on its concentration. Moreover, they lead to a scheme of different corrosion products layers based on the porous electrode theory of de Levie. This physical model describes the behavior of cast iron with and without free chlorine and at any time of immersion. The experimental impedance diagrams were at first fitted by the measurement model developed by Orazem et al, in order to identify the stochastic error and to delete non-stationary points. Then the regression of the physical model to the data provided the value of the anodic charge transfer resistance and, in this way, the value of the corrosion current. As the anodic charge transfer resistance was found to have the same order of magnitude as the polarization resistance, a simpler technique than the electrochemical impedance can be used to assess the corrosion rate. (C) 1999 Elsevier Science Ltd. All rights reserved.