Electrochemical behaviour of copper/LDPE composites in the simulated uterine solution
Electrochemical behaviour of copper/LDPE composites in the simulated uterine solution
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铜/LDPE复合材料在模拟子宫溶液中的电化学行为
DOI：
10.1016/j.electacta.2006.02.034
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发表时间：
2006-08-15
影响因子：
6.6
通讯作者：
Gui, Yanghai
中科院分区：
文献类型：
--
作者：
Wen, Feng;Xie, Changsheng;Gui, Yanghai
两种金属/绝缘体复合材料，铜/低密度聚乙烯（LDPE）微复合材料和铜/LDPE纳米复合材料，在一个均匀的金属质量分数制备。通过循环伏安法、动电位极化测量和电化学阻抗谱研究了两种复合材料在模拟子宫液中的腐蚀特性。结果表明，两种材料的腐蚀速率和腐蚀机理存在明显差异。与微米复合材料相比，纳米复合材料腐蚀反应稳定，几乎不钝化，腐蚀速率低，铜向可溶性铜离子的转化率高，是理想的宫内节育器材料。微米复合材料的腐蚀行为受Cu ~（2+）扩散和电荷转移过程共同控制，而纳米复合材料的腐蚀行为仅受电荷转移过程控制。本文还比较了复合材料与块体铜在模拟子宫液中的腐蚀行为，块体铜在腐蚀过程中产生的不溶性副产物比复合材料多。此外，电化学方法在这项研究中被证明是有用的表征高电阻率材料的腐蚀行为。(c)2006爱思唯尔有限公司保留所有权利。
Two metal/insulator composites, copper/low-density polyethylene (LDPE) microcomposites and copper/LDPE nanocomposites, were prepared in a uniform metal mass fraction. The corrosion characteristics of the two composites in the simulated uterine solution have been studied by cyclic voltammetry, potentiodynamic polarization measurement and electrochemical impedance spectroscopy. Results obtained during this study show that there are obvious differences on the corrosive rates and mechanisms between the two materials. The nanocomposites have stable corrosive reaction, hardly passivation, low corrosion rate and high transformation ratio of copper to soluble cupric ions compared with microcomposites, which indicate that the nanocomposites are perfect to be the novel material for intrauterine device. The corrosion behaviour of the microcomposites was controlled by both the processes of the pervasion of Cu2+ and the transfer of the charge, while that of the nanocomposites was only controlled by the transfer of the charge. This paper also compared the corrosion behaviours of the composites and bulk copper in the simulated uterine solution, there were more insoluble subproducts in the corrosion process of bulk copper than the composites. Further, the electrochemical method in this study is proved to be useful to characterize the corrosion behaviour of high electrical resistivity materials. (c) 2006 Elsevier Ltd. All rights reserved.