Copper Corrosion Behavior in Simulated Concrete-Pore Solutions
Copper Corrosion Behavior in Simulated Concrete-Pore Solutions
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DOI：
10.3390/met10040474
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发表时间：
2020-04-01
期刊：
影响因子：
2.9
通讯作者：
Alpuche-Aviles, Mario A.
中科院分区：
文献类型：
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作者：
Bacelis, Angel;Veleva, Lucien;Alpuche-Aviles, Mario A.
采用饱和Ca(OH)(2)和水泥萃取液两种碱性电解质模拟混凝土孔隙环境，对铜的腐蚀进行了30天的研究。在开路电位（OCP）下进行了电化学阻抗谱（EIS）和循环伏安法，并进行了动电位极化（PDP）曲线的比较。电化学电流波动被认为是电化学噪声（EN），是一种无损检测方法。试验结果表明，sat. Ca(OH)(2)对Cu表面的侵蚀性较弱，主要是由于ph值低1个数量级，因此Cu的OCP值更正，极化电阻值高1个数量级，且Cu的阳极电流低于水泥萃取液。分析结果表明，Cu表面的初始腐蚀攻击是准均匀的，这是由于两种模型溶液中都发生了固定的持续腐蚀过程。XPS分析和x射线衍射（XRD）图谱显示，在sat. Ca(OH)(2)中，形成Cu2O/CuO腐蚀层，有效保护金属cu表面。我们提出了Cu连续氧化为（+1）和（+2）的证据，它对腐蚀层的影响，以及它的保护性能。
The copper corrosion was studied for 30 days in two alkaline electrolytes: saturated Ca(OH)(2) and cement extract, employed to simulate concrete-pore environments. Electrochemical Impedance Spectroscopy (EIS) and Cyclic Voltammetry were carried out at the open circuit potential (OCP), and potentiodynamic polarization (PDP) curves were performed for comparative purposes. Electrochemical current fluctuations, considered as electrochemical noise (EN), were employed as non-destructive methods. The tests revealed that sat. Ca(OH)(2) is the less aggressive to the Cu surface, mainly because of the lower in one order pH. In consequence, the OCP values of Cu were more positive, the polarization resistance values were higher by one order of magnitude, and the anodic currents of Cu were lower than those in the cement extract. The analyzed EN indicated that the initial corrosion attacks on the Cu surface are quasi-uniform, resulting from the stationary persistent corrosion process occurring in both model solutions. XPS analysis and X-ray diffraction (XRD) patterns revealed that in sat. Ca(OH)(2), a Cu2O/CuO corrosion layer was formed, which effectively protects the metallic Cu-surface. We present evidence for the sequential oxidation of Cu to the (+1) and (+2) species, its impact on the corrosion layer, and also its protective properties.