Atmospheric corrosion of Cu, Zn, and Cu-Zn alloys protected by self-assembled monolayers of alkanethiols
Atmospheric corrosion of Cu, Zn, and Cu-Zn alloys protected by self-assembled monolayers of alkanethiols
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DOI：
10.1016/j.susc.2015.10.045
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发表时间：
2016-06-01
期刊：
影响因子：
1.9
通讯作者：
Leygraf, Christofer
中科院分区：
文献类型：
--
作者：
Hosseinpour, Saman;Forslund, Mattias;Leygraf, Christofer
在本文中，为了比较自组装单层烷硫醇（SAM）对暴露于加速室内大气腐蚀条件下的铜、锌和铜锌合金的保护效率，收集了早期研究的结果。结果是基于表面光谱学和显微镜技术的结合。所研究的SAMs的保护效率随着链长的增加而增加，这是由于腐蚀刺激剂在大气环境、水、氧和甲酸中对铜表面的传输阻碍。输运阻是选择性的，在裸铜和保护铜上产生不同的腐蚀产物。铜表面表面的SAMs分子结构最初是有序的，但随着曝光时间的延长，分子结构的有序程度降低。十八烷硫醇（Octadecanethiol， ODT）对铜的保护作用明显优于锌，这可能是由于Cu-S的结合强度高于Zn-S。尽管存在这些差异，但单相Cu20Zn黄铜合金的ODT防腐效率与铜相当，而非均相双相Cu40Zn黄铜合金的ODT防腐效率明显低于铜。(C) 2015年作者。Elsevier B.V.出版
In this article results from earlier studies have been compiled in order to compare the protection efficiency of self-assembled monolayers (SAM) of alkanethiols for copper, zinc, and copper-zinc alloys exposed to accelerated indoor atmospheric corrosion conditions. The results are based on a combination of surface spectroscopy and microscopy techniques. The protection efficiency of investigated SAMs increases with chain length which is attributed to transport hindrance of the corrosion stimulators in the atmospheric environment, water, oxygen and formic acid, towards the copper surface. The transport hindrance is selective and results in different corrosion products on bare and on protected copper. Initially the molecular structure of SAMs on copper is well ordered, but the ordering is reduced with exposure time. Octadecanethiol (ODT), the longest alkanethiol investigated, protects copper significantly better than zinc, which may be attributed to the higher bond strength of Cu-S than of Zn-S. Despite these differences, the corrosion protection efficiency of ODT for the single phase Cu20Zn brass alloy is equally efficient as for copper, but significantly less for the heterogeneous double phase Cu40Zn brass alloy. (C) 2015 The Authors. Published by Elsevier B.V.