手持式X射线荧光光谱仪在高压隔离开关触头镀银层腐蚀故障分析中的应用  

Application of portable X-ray fluorescence spectrometer to corrosion problem analysis of silver coating on high-voltage disconnecting switch contact

作　　者：王志高 林涛 伍科 耿植 刘继午 兰新生 肖茂 WANG Zhi-gao;LIN Tao;WU Ke;GENG Zhi;LIU Ji-wu;LAN Xin-sheng;XIAO Mao(State Grid Sichuan Electric Power Research Institute,Chengdu 610041,China)

机构地区：[1]国网四川省电力公司电力科学研究院,四川成都610041 [2]国网四川省电力公司泸州供电公司,四川泸州646000

出　　处：《电镀与涂饰》2019年第23期1311-1314,共4页Electroplating & Finishing

基　　金：国网四川省电力公司科技项目(521997160013)

摘　　要：针对一起110 kV隔离开关触头的腐蚀故障,采用手持式X射线荧光光谱仪分析故障隔离开关触头镀层的化学成分,发现厂家使用银氧化锡(Ag-SnO2)镀层代替镀银层。分析认为在工业含硫大气环境中,Ag-SnO2镀层中的银被SO2、H2S等硫化物腐蚀,铜基体在潮湿环境下腐蚀生成Cu2(OH)2CO3,从而导致隔离开关触头导电回路的接触电阻升高,引发过热故障。针对此次故障,提出了解决措施和建议。As for the corrosion problem of a I 10 kV disconnecting switch contact,the chemical composition of coating on it was analyzed using a portable X-ray fluorescence spectrometer.It was found that the manufacturer used silver-tin oxide(Ag-SnO2)coating instead of pure silver coating.The analysis results showed that silver in Ag-SnO2 coating was corroded by sulfides such as SO2 and H2 S in the sulfur-containing industrial atmosphere,and then the copper substrate was corroded to form Cu2(OH)2 CO3 in a moist environment,leading to an increase in contact resistance of the conductive circuit of disconnecting switch contact,hence causing an overheat fault finally.Some countermeasures and advices were given for this failure.

关 键 词：隔离开关触头 腐蚀 电刷镀银 银氧化锡镀层 手持式X射线荧光光谱仪 

分 类 号：TQ153.16[化学工程—电化学工业]