Root cause of corrosion failure of tin coating on wire clamp in marine atmosphere  

作　　者：Zhen Zhong Wang-yan Ly Teng-yuan Liu Yi Xie Yang Yang Zhen-zhu Wang Deng-ke Li Xiao-bo Li Tang-qing Wu 

机构地区：[1]School of Materials Science and Engineering,Xiangtan University,Xiangtan 411105,Hunan,China [2]Electric Power Research Institute of Guangdong Power Grid Co.,Ltd.,Guangzhou 510080,Guangdong,China [3]Shenyang National L aboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,Liaoning,China [4]School of Materials Science and Engineering.University of Science and Technology of China,Shenyang 110016,Liaoning,China [5]Electric Power Research Institute,State Grid Hunan Electric Power Company,Changsha 410007,Hunan,China [6]School of Mechanical Engineering and Mechanics,Xiangtan University,Xiangtan 411105,Hunan,China [7]School of Information Science and Engineering,Changsha Normal University,Changsha 410199,Hunan,China

出　　处：《Journal of Iron and Steel Research International》2024年第4期998-1014,共17页

基　　金：supports of National Natural Science Foundation of China(51971191);Henan Provincial Key R&D Program of China(2021GK2008);Youth Backbone Teacher Training Program of Henan Province(2021GGJS004).

摘　　要：The failure cause of a tinned copper wire clamp in marine atmosphere was studied systematically by X-ray photoelectron spectroscopy,scanning electron microscopy with energy dispersive spectroscopy and electrochemical measurements.The main components of the green rust on the surface of the damaged wire clamp are SnO_(2),CuO,Cu_(2)Cl(OH)_(3) and CuCO(OH)_(2).Much of green rust distributes at the platform edge along the axial direction on the crimp connection,and severe corrosion and corrosion pits occur at the platform edge zone along the axial direction.The enriching Cl-at the marine atmosphere and the existing O_(2) in air collectively enhance the corrosion process of the tin coating and the copper matrix.Finite element model results show that the residual stress and strain of the tin coating are the largest at the platform edge along the axial direction on the crimp connection,and the corresponding electrode potential of the tin coating at this zone drops significantly.The above results indicate that the residual strain increases the driving force of the corrosion electrochemical reactions and accelerates the corrosion rate and the pit corrosion of the tin coating at this zone.

关 键 词：Tin coating Marine atmosphere Residual strain-Chloride ion Corrosion failure 

分 类 号：TG174[金属学及工艺—金属表面处理]