Theoretical assessment of discharge effects on the decomposition tendency of C_(6)F_(12)O over metallic surfaces  

作　　者：Zhaolun Cui Yanpeng Hao Shuangshuang Tian Xiaoxing Zhang Yashuang Zheng 

机构地区：[1]School of Electric Power Engineering,South China University of Technology,Guangzhou,China [2]State Key Laboratory of Power Transmission Equipment Technology(Chongqing University),Chongqing,China [3]School of Electrical and Electronic Engineering,Hubei University of Technology,Wuhan,China

出　　处：《High Voltage》2024年第4期862-869,共8页高电压（英文）

基　　金：Open Fund Project of State Key Laboratory of Power Transmission Equipment Technology,Grant/Award Number:SKLPET-kfkt202308;Guangdong Province Fundamental and Applied Fundamental Research Fund,Grant/Award Number:2021A1515110704;National Natural Science Foundation of China,Grant/Award Number:52207155。

摘　　要：C_(6)F_(12)O is proposed to be one potential eco-friendly insulation gas to replace SF6.However,the assessment of its decomposition properties and the compatibility with metal electrodes in discharge faults is still challenging,which greatly hinders the development of its insulation and arc-extinction applications.Herein,a theoretical method is proposed to reasonably address the discharge effects on C_(6)F_(12)O decomposition over typical Cu and Al electrodes at atomic scale.The results show that both the external electric field and the excess electrons could affect the activation of C_(6)F_(12)O by changing the electron acceptance of C_(6)F_(12)O and the orbital hybridisation during the surface bonding.On metal surfaces,the C-F single bond in adsorbed C_(6)F_(12)O is the weakest position to decompose,and its cleavage could be promoted by the discharge effects.After the C-F breaking,the C-C cleavage remains unfavourable on Cu(111),but it is significantly promoted on Al(111),indicating a higher corrosion risk on the Al surface via continuous C_(6)F_(12)O decompositions.The proposed method as a valid supplement to the experiment reveals the discharge effects and the decomposition tendency of C_(6)F_(12)O on metal electrodes in discharge faults,which broadens the means for insulation gas evaluation.

关 键 词：corrosion INSULATION CLEAVAGE 

分 类 号：TG14[一般工业技术—材料科学与工程]