The effect of Cu-rich sub-layer on the increased corrosion resistance of Cu–xZn alloys in chloride containing borate buffer
The effect of Cu-rich sub-layer on the increased corrosion resistance of Cu–xZn alloys in chloride containing borate buffer
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DOI：
10.1016/j.electacta.2006.05.024
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发表时间：
2006-10
影响因子：
6.6
通讯作者：
I. Milošev;T. K. Mikić;M. Gaberšček
中科院分区：
文献类型：
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作者：
I. Milošev;T. K. Mikić;M. Gaberšček
研究了 Cu-xZn 合金及其组成金属在含有摩尔范围为 0.01 至 1M 的氯离子的硼酸盐缓冲液中的电化学行为。比较了这些材料在阳极极化下的特性，并通过SEM和EDS分析了极化实验过程中形成的腐蚀产物的成分和形貌。 X 射线光电子能谱和电化学阻抗测量用于表征 Cu、Zn 和 Cu-40Zn 合金在 Eocin（含有两种不同浓度氯离子的硼酸盐缓冲液）中浸泡 2 小时期间形成的表面层。揭示了黄铜在 Eoc 条件下行为的新方面。与金属锌相比，黄铜在氯化物介质中的耐腐蚀性能得到改善，这归因于锌的选择性溶解形成的富铜层。基于这些结果，提出了一个描述 Cu-40Zn 合金相对于 Zn 金属耐腐蚀性能提高的结构模型。
The electrochemical behaviour of Cu–xZn alloys, as well as their constituent metals, in a borate buffer containing chloride ions in the molar range from 0.01 to 1M are studied. Characteristics of these materials under anodic polarization are compared and the composition and morphology of the corrosion products formed in the course of polarization experiment are analysed by SEM and EDS. X-ray photoelectron spectroscopy and electrochemical impedance measurements are used for characterization of the surface layers formed on Cu, Zn and Cu–40Zn alloy during 2-h immersion at Eocin a borate buffer containing two different concentrations of chloride ions. New aspects of the behaviour of brass under Eoccondition are revealed. The improved corrosion resistance of brass in chloride media, if compared to zinc metal, is attributed to a Cu-rich layer formed by the selective dissolution of zinc. Based on the results, a structural model describing the improved corrosion resistance of Cu–40Zn alloy with respect to Zn metal is proposed.