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高压电器  2014 

户外隔离开关导电管断裂分析

, PP. 124-128

Keywords: 户外隔离开关,导电管,晶间腐蚀,剥蚀

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Abstract:

某型号隔离开关产品铝合金导电管在使用过程中发生异常断裂,通过宏观检验、化学分析、金相检验、扫描电镜与能谱分析等方法对导电管断裂的原因进行了分析。结果表明导电管是由于剥落腐蚀断裂的。导电管处于潮湿工作环境并存在Cl-。其腐蚀过程为先在表面氧化膜不均匀处,甚至局部破裂处发生点蚀,然后发展成晶间腐蚀,在晶间腐蚀和内应力的协同作用下导致剥蚀。

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