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Advancements in non-destructive control of efficiency of electrochemical repair techniques

机译：电化学修复技术效率的无损控制研究进展

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The main electrochemical techniques used for reducing corrosion on reinforced structures are cathodic protection (CP), electrochemical chloride extraction (ECE) and realkalisation (ER). Traditionally, for controlling the efficiency of CP, standard methods based in the depolarisation of rebar are used, with inconvenience of requiring the interruption of the protection current even for several hours. Concerning ECE and ER, the usual methods involve extraction and chemical analysis (chloride and hydroxyl ions respectively) of cores from the structure. In this paper, some non-destructive methods for monitoring the performance of the electrochemical repair techniques, are presented and analysed. In CP, a new developed methodology, called passivity verification technique (PVT), which uses the electrochemical impedance spectroscopy concept, is described. This is a fast method that does not require interruption of the cathodic protection current and the results obtained are in agreement with those obtained by standard depolarisation methods. As long as ECE and ER are concerned, the corrosion potential and corrosion rate measured by the polarisation resistance technique are the suggested non-destructive indicators of the efficiency of the technique at the end of the treatment. Additionally, for ER, the detection of a sudden increase in the intensity of electrical current passing, and a parallel establishment of electro-osmotic flux, is also postulated as a key parameter for practical control during the application of the efficiency of the realkalisation. Finally, it is also presented a new parameter 'standardised by the resistance charges (SRC)', which would be a more indicative parameter than simple recording the coulombs to check the efficiency during ECE treatment.
机译：用于减少增强结构腐蚀的主要电化学技术是阴极保护（CP），电化学氯化物萃取（ECE）和再碱化（ER）。传统上，为了控制CP的效率，使用了基于钢筋去极化的标准方法，其不便之处在于甚至需要几个小时才能中断保护电流。关于ECE和ER，通常的方法包括从结构中提取和化学分析核（分别为氯离子和氢氧根离子）。本文提出并分析了一些用于监测电化学修复技术性能的非破坏性方法。在CP中，描述了一种新开发的方法，称为无源验证技术（PVT），它使用电化学阻抗谱概念。这是一种快速方法，不需要中断阴极保护电流，并且获得的结果与通过标准去极化方法获得的结果一致。只要考虑到ECE和ER，通过极化电阻技术测得的腐蚀电位和腐蚀速率就暗示了在处理结束时该技术效率的非破坏性指标。此外，对于ER，还假定检测到通过的电流强度突然增加，以及并行建立电渗通量，作为在实际应用效率过程中进行实际控制的关键参数。最后，它还提出了一个新的参数“通过电阻电荷（SRC）标准化”，这比简单记录库仑以检查ECE治疗期间的效率更具指示性。

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