The synergetic effect of chloride and sulphate on pitting corrosion of copper
The synergetic effect of chloride and sulphate on pitting corrosion of copper
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DOI：
10.1016/s0010-938x(96)88250-3
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发表时间：
1996-10
影响因子：
8.3
通讯作者：
J. Duthil;G. Mankowski;A. Giusti
中科院分区：
文献类型：
--
作者：
J. Duthil;G. Mankowski;A. Giusti
本文用孔诱导时间的统计分析方法研究了铜在含氯化物和硫酸盐的硼酸盐缓冲溶液中的孔腐蚀。点蚀敏感性通过由点蚀诱导时间分布推导出的点蚀产生率（λ 0）来量化。硫酸根离子与氯离子一样，也能诱发铜点蚀，且观察到相同的点蚀诱发时间分布规律。然而，硫酸根离子比氯离子更具侵蚀性。在这两种物质的存在下，λ 0的变化似乎是复杂的。根据氯化物含量，显示出三个区域。在第一个区域中，对应于低氯化物含量，负责铜点蚀的物种是硫酸根离子。增加氯化物含量产生λ 0的增加，表明氯离子的加速效应。在第二区，在中等氯离子含量下，硫酸根离子始终是点蚀的主要形成物，而氯离子则由于λ 0减小而起抑制作用。然后在这两个第一区域之间达到λ 0的最大值，并且相应的氯化物含量似乎与硫酸盐含量无关。第三个区域对应于高含量的氯离子，在这里，是负责点蚀的物种。随着氯离子含量的增加，λ 0迅速增加。对于相同的氯化物与硫酸盐的比例，总是观察到对应于第二和第三区域之间的过渡的λ 0的最小值，因此这是这两种侵蚀性离子之间的竞争造成的。
The pitting corrosion of copper in chloride and sulphate containing borate-buffered solutions has been investigated by statistical analysis of pit induction times. The pitting susceptibility is quantified by the pit generation rate (λ0) deduced from the pit induction time distributions. Sulphate ions, like chloride ions, can induce copper pitting and the same pit induction time distribution laws are observed. However sulphate ions are more aggressive than chloride ions. In the presence of both species the variation of λ0appears to be complex. Depending on the chloride content, three zones are revealed. In the first zone, corresponding to low chloride contents, the species responsible for copper pitting were the sulphate ions. Increasing the chloride content produces an increase of λ0showing an accelerating effect of the chloride ions. In the second zone, for medium chloride contents, the sulphate ions were always the species which produced copper pitting but chloride ions had an inhibiting effect since λ0decreased. A maximum of λ0was then reached between these two first zones and the corresponding chloride content appeared to be independent of the sulphate content. The third zone corresponds to high contents of chloride ions which, here, were the species responsible for pitting. The rate λ0increased rapidly with increasing chloride content. The minimum of λ0corresponding to the transition between the second and third zones was always observed for the same chloride to sulphate ratio and thus resulted from competition between these two aggressive ions.