A corrosion failure analysis of copper wires used in outdoor terminal boxes in substation

作     者：Wu, Tangqing Zhou, Zhaofen Xu, Song Xie, Yi Huang, Lu Yin, Fucheng 

作者机构：Xiangtan Univ Sch Mat Sci & Engn Key Lab Mat Design & Preparat Technol Hunan Prov Xiangtan 411105 Peoples R China State Grid Hunan Elect Power Co Elect Power Res Inst Changsha 410007 Hunan Peoples R China Hunan Xiangdian Boiler & Pressure Vessel Inspect Changsha 410001 Hunan Peoples R China State Grid Hunan Elect Power Co Xiangtan Power Supply Co Xiangtan 411000 Peoples R China 

出 版 物：《ENGINEERING FAILURE ANALYSIS》 (工程事故分析)

年 卷 期：2019年第98卷

页      面：83-94页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 

基　　金：National Natural Science Foundation of China China Postdoctoral Science Foundation [2018T110836, 2017M622594] 

主　　题：Pure copper Chloride ion (Cl-) Atmospheric corrosion Relative humidity (RH) 

摘      要：Many investigations in the field and laboratory have verified that sulfates and chlorides are the common corrosion products of copper and its alloys in rural and marine atmospheric environments, respectively. However, our field investigation found that a large amount of atacamite appeared in the corrosion products of copper wires in terminal boxes in a rural atmospheric environment. In this paper, SEM, XRD, XPS, electrochemical analysis and ion analysis were collectively used to uncover the essential reasons for this exceptional phenomenon. The experimental results show that the chlorine element in the corrosion product is derived from the Number Tube used to mark the copper wire in terminal boxes. The chloride ion (Cl-) and relative humidity (RH) are the key factors that affect the corrosion behavior of the copper wire, and the residual stress in the wire is another important factor to accelerate its corrosion. The research results of this paper can enrich the understanding of the corrosion behavior of copper in the atmospheric environment.