环境溶液及硅橡胶对电缆用铜带发黑现象的影响

Effect of Environmental Solution and Silicone Rubber on Blackening of Copper Strips for Cables

采用控制变量法分析环境溶液及硅橡胶对铜带发黑的影响。结果表明:有硅橡胶存在的铜带出现发黑现象,而在NaCl溶液中发黑现象最严重。SEM及EDS结果显示,铜带表面黑色斑点存在大量的点蚀坑,点蚀坑内大多存在Si、S、Cl等元素,线扫描结果显示与基体衬度不同的发黑部位氧含量较高。FTIR结果表明,在出现黑斑铜带上的硅橡胶发生了水解。液体介质不是铜带发黑的原因,Cl-对铜带基体的点蚀作用及硅橡胶的富氧作用是导致铜带发黑的根本原因。

The influence of environmental solution and silicone rubber on the blackening of copper strip was analyzed by the control variable method.The results show that black phenomenon appeared on the copper strip with silicone rubber,while the black phenomenon was most serious in NaCl solution.The results of SEM and EDS show that there were a lot of pitting pits on the black spots on the surface of the copper strip.Si,S,Cl and other elements were mostly present in the pits.The line scan results show that the oxygen content of the black parts with different substrate contrast was relatively high.The FTIR results showed that the silicone rubber on the black spot copper strip was hydrolyzed.The liquid medium was not the cause of the blackening of copper strip.The pitting effect of Cl^-on copper strip matrix and the oxygen enrichment of silicone rubber were the root causes of blackening of the copper strip.