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首页> 外文会议>International Workshop On Measurement and Interpretation of the On-site Corrosion Rate MESINA Feb 22-23, 1999, Madrid, Spain >NUMERICAL SIMULATION OF CORROSION RATE DETERMINATION BY LINEAR POLARIZATION
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NUMERICAL SIMULATION OF CORROSION RATE DETERMINATION BY LINEAR POLARIZATION

机译：线性极化法测定腐蚀速率的数值模拟

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摘要

The polarization resistance technique is an accepted method of quantifying the corrosion rate of reinforcing steel in concrete. However, in the literature some doubt has been expressed regarding the reliability of polarization resistance measurements when applied to structures significantly influenced by macrocell action. As experimental tests are mostly performed in a laboratory environment using small specimens, correlations to quantify the effects of macrocell versus microcell action have not been performed. In order to elucidate this possible problem, the polarization behaviour of a planparallel arrangement of a two-component active/passive macrocell was investigated by a numerical analysis. The electrochemical behaviour of the concrete electrolyte and the steel/concrete interface have been modelled by a network of discrete linear and nonlinear resistive elements, respectively. The numerical results obtained clearly demonstrate that the polarizing current is distributed over the two components. For the corroding component of the macrocell the corrosion rate was slightly underestimated by the polarization resistance measurement. However, the corrosion rate of the passive component was extremely overestimated. Based on the results of the numerical simulation it was concluded that passive steel is erroneously identified as actively corroding steel, both from potential as well as from polarization measurements.
机译：耐极化技术是量化混凝土中钢筋腐蚀速率的公认方法。然而，在文献中，当将极化电阻测量应用到受宏单元作用显着影响的结构时，人们对其极化电阻测量的可靠性表示了怀疑。由于实验测试主要是在实验室环境中使用小样本进行的，因此尚未进行量化大细胞对微细胞作用的相关性的相关分析。为了阐明此可能的问题，通过数值分析研究了双分量有源/无源宏单元的平面平行排列的极化行为。混凝土电解质和钢/混凝土界面的电化学行为分别通过离散的线性和非线性电阻元件网络进行建模。获得的数值结果清楚地表明极化电流分布在两个分量上。对于大电池的腐蚀成分，极化电阻测量结果略微低估了腐蚀速率。但是，被动组件的腐蚀速率被高估了。根据数值模拟的结果，可以得出结论，无论是从电位还是从极化测量结果来看，被动钢都被误认为是主动腐蚀钢。

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