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Insights from corrosion current measurements on corrosion mechanisms in reinforced concrete and on the evaluation of other corrosion data

机译：腐蚀电流测量对钢筋混凝土腐蚀机理和其他腐蚀数据评估的启示

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During the past years Tafel polarization measurements have been implemented into the scope of measurements of CITec corrosion diagnosis projects. This has created a vast database of different and corresponding corrosion parameters, such as chloride and water content in the rebar vicinity, open circuit potential, electrolyte resistance, polarization resistance (from galvanostatic pulse and linear polarization) and corrosion current from Tafel polarization measurements. Although general limitations in using these methods on macro cell systems such as reinforced concrete are known, the comparative assessment of these data has led to a better understanding of the corrosion behaviour and of specific circumstances of the structures which deviated partly from usual expectations. For instance, a low polarization resistance at high chloride content will not result necessarily in a high corrosion current, if the reinforcement in the wider vicinity of the test location is similar active, and cathodic rebar areas are either very distant or retarded by very wet concrete. So the extended range of corrosion testing gives a more precise evaluation of the corrosion situation and permits a tailored repair and maintenance concept to be found. It has also been found that the Stern-Geary equation which is often used to calculate corrosion current densities and material loss of the reinforcement from linear polarization (LPR) measurements, doesn’t seem very feasible if used on reinforced concrete structures, as there appears to be a dominant influence of macro cell corrosion over the corrosion model of a homogenous mixed electrode (for which the Stern-Geary equation applies), and the true corrosion current densities may be either larger or (very often) much smaller than those calculated from Stern-Geary. This is not a new observation, and the findings will be discussed for several project cases.
机译：在过去的几年中，Tafel极化测量已应用于CITec腐蚀诊断项目的测量范围。这创建了一个庞大的数据库，其中包含不同且相应的腐蚀参数，例如钢筋附近的氯化物和水含量，开路电势，电解质电阻，极化电阻（来自恒电流脉冲和线性极化）以及来自Tafel极化测量的腐蚀电流。尽管在宏单元系统（如钢筋混凝土）上使用这些方法的一般限制是已知的，但是对这些数据的比较评估已使人们更好地了解了腐蚀行为以及结构的特定情况，这部分偏离了通常的预期。例如，如果在测试位置的较宽区域内的钢筋具有相似的活性，并且阴极钢筋区域距离很远或受潮湿的混凝土阻碍，则在高氯化物含量下的低极化电阻不一定会导致高腐蚀电流。 。因此，扩展的腐蚀测试范围可以对腐蚀情况进行更精确的评估，并可以找到量身定制的维修和保养概念。还发现，经常用于通过线性极化（LPR）测量来计算钢筋的腐蚀电流密度和材料损失的Stern-Geary方程，如果用于钢筋混凝土结构，则似乎不太可行。对均匀混合电极的腐蚀模型（适用Stern-Geary方程）的宏电池腐蚀起主要影响，并且实际腐蚀电流密度可能大于或（通常）小于由斯特恩·盖瑞（Stern-Geary）。这不是一个新发现，将针对几个项目案例讨论研究结果。

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