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

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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 SnO2,CuO,Cu2Cl(OH)3 and CuCO3(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 O2 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.

Tin coatingMarine atmosphereResidual strainChloride ionCorrosion failure

Zhen Zhong、Wang-yan Lv、Teng-yuan Liu、Yi Xie、Yang Yang、Zhen-zhu Wang、Deng-ke Li、Xiao-bo Li、Tang-qing Wu

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School of Materials Science and Engineering,Xiangtan University,Xiangtan 411105,Hunan,China

Electric Power Research Institute of Guangdong Power Grid Co.,Ltd.,Guangzhou 510080,Guangdong,China

Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,Liaoning,China

School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,Liaoning,China

Electric Power Research Institute,State Grid Hunan Electric Power Company,Changsha 410007,Hunan,China

School of Mechanical Engineering and Mechanics,Xiangtan University,Xiangtan 411105,Hunan,China

School of Information Science and Engineering,Changsha Normal University,Changsha 410199,Hunan,China

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国家自然科学基金Henan Provincial Key Research and Development Program of ChinaYouth Backbone Teacher Training Program of Henan Province

519711912021GK20082021GGJS004

2024

10.1007/s42243-023-01122-0

钢铁研究学报(英文版)
钢铁研究总院

钢铁研究学报(英文版)

CSTPCD
影响因子：0.584
ISSN：1006-706X
年,卷(期)：2024.31(4)