某沿海变电站HGIS套管接线端子镀银层腐蚀剥落的原因
Reasons for Corrosion and Exfoliation of Silver Coating on Bushing Wiring Board of HGIS in a Coastal Substation
摘 要
某沿海变电站66 kV复合式气体绝缘金属封闭开关(HGIS)套管接线端子一侧的镀银层出现大面积腐蚀剥落现象。采用宏观形貌观察、化学成分分析、金相检验和扫描电镜等试验方法,结合服役地区大气环境数据对镀银层失效原因进行了研究分析。结果表明:起泡及剥离的镀银层已发生氧化或者硫化,暴露出来的铝合金基材已被氧化;腐蚀介质通过镀银层表面凹坑、划痕或界面孔隙等通道进入镀层与基体界面是导致接线端子镀银层腐蚀脱落的主要原因。
镀银层
接线端子
变电站
corrosion
silver coating
wiring board
substation
Abstract
The silver coating on one side of bushing wiring board of 66kV hybrid gas insulated switchgear (HGIS) in a coastal substation corroded and exfoliated in a large area. The failure reasons of the silver coating were studied by means of macroscopic morphology observation, chemical composition analysis, metallographic examination and scanning electron microscopy, combined with atmospheric environment data in service area. The results indicated that the blistered and exfoliated silver coating was oxidized or vulcanized, and the exposed substrate was also oxidized. The corrosive mediators entered the interface between the aluminum alloy substrate and silver coating through the pits, scratches or interfacial gaps on the surface of silver coating, which was the main reason for the corrosion and exfoliation of the silver coating on the wiring board.
中图分类号 TB304 DOI 10.11973/fsyfh-202205012
所属栏目 失效分析
基金项目
收稿日期 2020/7/22
修改稿日期
网络出版日期
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引用该论文: WANG Tianpeng,NIE Xiaobo,SUN Mingcheng,WANG Yunan. Reasons for Corrosion and Exfoliation of Silver Coating on Bushing Wiring Board of HGIS in a Coastal Substation[J]. Corrosion & Protection, 2022, 43(5): 68
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