Electrochemical detection of cupric ions with boron-doped diamond electrode for marine corrosion monitoring
Electrochemical detection of cupric ions with boron-doped diamond electrode for marine corrosion monitoring
复制标题
硼掺杂金刚石电极电化学检测铜离子用于海洋腐蚀监测
DOI：
10.1016/j.electacta.2015.12.194
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发表时间：
2016-06
影响因子：
6.6
通讯作者：
M. Nie;Stefano Neodo;J. Wharton;A. Cranny;N. Harris;R. Wood;K. Stokes
中科院分区：
文献类型：
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作者：
M. Nie;Stefano Neodo;J. Wharton;A. Cranny;N. Harris;R. Wood;K. Stokes
腐蚀引起的结构失效在许多工业情况下仍然是一个代价高昂的问题，并且用于结构健康完整性监测的鲁棒腐蚀传感系统的开发仍然是一个严峻的挑战。基于局部腐蚀微环境中铜离子的测定，研究了用掺硼金刚石电极（BDD）监测铜合金腐蚀的适用性。首次报道了在0.60 M NaCl水溶液中铜离子在BDD电极表面的电化学行为，结果表明，在含氯离子的电解质溶液中，铜离子在BDD电极上的电化学过程是两个连续的单电子转移步骤，在循环伏安图中产生两对分离良好的峰.与高氯酸根和硫酸根离子相比，观察到氯离子通过形成CuCl 2 −络合物对铜离子具有显著的稳定作用，因此在氯离子电解质溶液中，在BDD电极上获得的循环伏安图中具有两对分离良好的峰。用准稳态极化法测得氯离子电解质中Cu ~（2+）/Cu ~+氧化还原对的表观速率常数为0.94 × 10 - 6cm·s-1，表明Cu ~（2+）/Cu ~+氧化还原对的电子传递过程是准可逆的。此外，差分脉冲伏安法的结果表明，BDD电极是有前途的铜合金的腐蚀监测与铜离子的峰电流和浓度之间的良好的关系，而没有显着的干扰，从常见的金属离子在模拟海洋腐蚀环境中。
Corrosion induced structural failures continue to be a costly problem in many industrial situations, and the development of robust corrosion sensing systems for structural health integrity monitoring is still a demanding challenge. The applicability of corrosion monitoring of copper alloys using a boron-doped diamond electrode (BDD) has been performed based on determination of copper ions within localised corrosion microenvironments. The electrochemical behaviour of copper ions on the BDD electrode surface were first reported in details in 0.60 M NaCl aqueous solution, and the results revealed that the electrochemical processes of copper ions on the BDD electrode proceed as two successive single electron transfer steps producing two well-separated pairs of peaks in cyclic voltammograms in the chloride ion containing electrolyte solutions. Compared with perchlorate and sulphate ions, chloride ions were observed with a significant stabilization effect on copper ions via the formation of CuCl2−complex, thus having two well-separated pairs of peaks in the obtained cyclic voltammograms on the BDD electrode in the chloride ion electrolyte solution. The apparent rate constant for the redox couple of Cu2+/Cu+in chloride ion electrolyte was determined as 0.94 × 10−6cm s−1by using quasi-steady polarisation technique, thus indicating a quasi-reversible electron transfer process of Cu2+/Cu+redox couple. Moreover, differential pulse voltammetric results exhibited the BDD electrode is promising for corrosion monitoring of copper alloys with an excellent relationship between peak current and concentration of copper ions without significant interference from the commonly presented metal ions within the simulated marine corrosion environments.