镀银铜基电接触器件在沿海大气环境中的组织结构变化  

Microstructure change of silver-plated copper electrical connectors exposed in coastal atmosphere

作　　者：陈云翔 陈奕扬 杨丙坤 张波 万芯瑗 夏晓健 赵博[3] CHEN Yunxiang;CHEN Yiyang;YANG Bingkun;ZHANG Bo;WAN Xinyuan;XIA Xiaojian;ZHAO Bo(Electric Power Research Institute of State Grid Fujian Electric Power Company Limited,Fuzhou 350007,China;State Key Laboratory of Advanced Power Transmission Technology,State Grid Smart Grid Research Institute Co.,Ltd.,Beijing 102209,China;China Special Equipment Inspection and Research Institute,Beijing 100029,China)

机构地区：[1]国网福建省电力有限公司电力科学研究院,福建福州350007 [2]国网智能电网研究院有限公司,先进输电技术国家重点实验室,北京102209 [3]中国特种设备检测研究院,北京100029

出　　处：《电镀与涂饰》2024年第6期140-147,共8页Electroplating & Finishing

基　　金：国家电网有限公司总部科技项目(5200-202158364A-0-0-00)。

摘　　要：[目的]研究镀银铜基电接触器件暴露在沿海大气环境中时镀银层的组织变化过程。[方法]分析和比较了镀银铜基电接触器件在海洋大气中暴露不同时间后的宏观形貌、微观形貌及其腐蚀电化学行为。[结果]在海洋大气中暴露1年时电接触器件为银白色,3年后变为浅黄色,6年后电接触器件表面布满铜绿。微观形貌观察表明,电接触器件在海洋大气中暴露的前3年内镀银层基本完好,其主要物相为单质Ag和Ag2O。6年后镀银层基本脱落,主要物相为Cu、CuO和Cu(OH)2。电化学测试表明,电接触器件的导电性随着海洋大气暴露时间的延长而逐渐变差。[结论]本研究可为镀银铜基电接触器件在沿海大气环境中使用寿命的评估提供参考。[Introduction]The changes in microstructure of silver-plated copper electrical connectors exposed in coastal atmosphere are needed to be studied.[Method]The appearance,microscopic morphology,and electrochemical corrosion behavior of silver-plated copper electrical connectors after exposure in coastal atmosphere for different time were analyzed and compared.[Result]The electrical connectors were silver-white after exposure in coastal atmosphere for 1 year,but turned to light yellow after 3 years,and covered with green copper corrosion products after 6 years.The scanning electron microscopic characterization showed that the silver coating on the surface of electrical connector was essentially intact during the initial 3 years of exposure to marine atmosphere,and its main phases were monomeric Ag and Ag2O.While the silver coating was also exfoliated and there were Cu,CuO,and Cu(OH)2 on the product surface after 6 years.The electrochemical test results showed that the electrical conductivity of electrical connector was decreased gradually with the extending of exposure time to coastal atmosphere.[Conclusion]This study is expected to provide reference for service life evaluation of silver-plated copper electrical connectors in coastal atmosphere.

关 键 词：铜基电接触器件 镀银层 沿海大气 组织结构 腐蚀行为 氧化 

分 类 号：TQ153.16[化学工程—电化学工业]