Effect of high rates of mass transport on oxygen reduction at copper electrodes: Implications for aluminium corrosion
Effect of high rates of mass transport on oxygen reduction at copper electrodes: Implications for aluminium corrosion
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DOI：
10.1016/j.elecom.2008.06.032
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发表时间：
2008-09-01
影响因子：
5.4
通讯作者：
Unwin, Patrick R.
中科院分区：
文献类型：
--
作者：
Colley, Anna L.;Macpherson, Julie V.;Unwin, Patrick R.
在铜微电极（直径25 μ m）在水溶液（pH 7）中的氧的还原进行了研究，在高质量传输的条件下，类似于所经历的类似μ m，大小的含铜夹杂物在铝合金腐蚀过程中。与先前在较低质量传输速率下操作的铜电极的研究相反，氧还原限制电流显示出随着质量传输速率的增加而朝向2减少的表观电子数（质量传输系数高达约100）。0.55 cm s（-1）），而不是4电子过程。这些新的数据表明，在微米和更小尺寸的铝合金中的铜金属间化合物的氧还原作为4电子转移过程的处理可能需要修改。皇冠版权所有（C）2008年出版的爱思唯尔B. V.保留所有权利。
The reduction of oxygen at copper microelectrodes (25 mu m diameter) in aqueous solution (pH 7) has been studied under conditions of high mass transport, similar to those experienced by similar to mu m, sized copper-containing inclusions in aluminium alloys during corrosion. Contrary to previous studies at copper electrodes operating at lower mass transport rates, oxygen reduction limiting currents show an apparent number of electrons which decrease towards 2 as the mass transport rate increases (mass transfer coefficients up to ca. 0.55 cm s(-1)), rather than a 4-electron process. These new data suggest that the treatment of oxygen reduction as a 4-electron transfer process at micron and smaller-sized copper intermetallics in aluminium alloys may require revision. Crown Copyright (C) 2008 Published by Elsevier B.V. All rights reserved.