变电站电流互感器铝合金法兰腐蚀失效分析
发布时间：2018-11-21 10:12
【摘要】：针对沿海变电站电流互感器压力释放膜铝合金法兰的实际腐蚀失效问题开展研究。通过对铝合金法兰成分、腐蚀形貌及腐蚀产物成分等分析,结合实际服役环境特点和电化学腐蚀行为分析,研究了其腐蚀失效原因及机理。结果表明,沿海工业环境下,铝合金CT压力释放膜法兰发生腐蚀及应力腐蚀开裂(SCC),腐蚀产物以Al的氯化物为主;Cl~-和S~(2-)是造成其腐蚀失效的重要环境因素,Cl~-和应力协同作用导致其SCC,法兰应采用耐Cl、S腐蚀及抗SCC铝合金,加强表面防腐蚀设计,不应在没有防护措施的条件下直接使用7A05铝合金。
[Abstract]:The actual corrosion failure of aluminum alloy flange with pressure release film of current transformer in coastal substation is studied. By analyzing the composition of aluminum alloy flange, corrosion morphology and corrosion products, combined with the characteristics of actual service environment and electrochemical corrosion behavior, the causes and mechanism of corrosion failure of aluminum alloy flange were studied. The results show that the corrosion and stress corrosion cracking of aluminum alloy CT pressure release film flange are mainly chlorides of Al in the coastal industrial environment. Cl~- and S2- are important environmental factors causing corrosion failure of SCC, flanges. The synergistic effects of Cl~- and stress lead to the use of Cl,S corrosion resistant and SCC resistant aluminum alloys for SCC, flanges, so as to strengthen the surface corrosion resistant design. 7A05 aluminum alloys should not be used directly without protective measures.
【作者单位】： 全球能源互联网研究院先进输电技术国家重点实验室;国网福建省电力有限公司泉州供电公司;国网福建省电力有限公司电力科学研究院;
【基金】：国家电网公司科技项目(5545DW170009)~~
【分类号】：TG172
本文编号：2346667
[Abstract]:The actual corrosion failure of aluminum alloy flange with pressure release film of current transformer in coastal substation is studied. By analyzing the composition of aluminum alloy flange, corrosion morphology and corrosion products, combined with the characteristics of actual service environment and electrochemical corrosion behavior, the causes and mechanism of corrosion failure of aluminum alloy flange were studied. The results show that the corrosion and stress corrosion cracking of aluminum alloy CT pressure release film flange are mainly chlorides of Al in the coastal industrial environment. Cl~- and S2- are important environmental factors causing corrosion failure of SCC, flanges. The synergistic effects of Cl~- and stress lead to the use of Cl,S corrosion resistant and SCC resistant aluminum alloys for SCC, flanges, so as to strengthen the surface corrosion resistant design. 7A05 aluminum alloys should not be used directly without protective measures.
【作者单位】： 全球能源互联网研究院先进输电技术国家重点实验室;国网福建省电力有限公司泉州供电公司;国网福建省电力有限公司电力科学研究院;
【基金】：国家电网公司科技项目(5545DW170009)~~
【分类号】：TG172
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