输电线路瓷绝缘子钢帽腐蚀特性研究  

Study on corrosion characteristics of porcelain insulator steel cap of transmission line

作　　者：伍弘 陈磊 郝金鹏 刘世涛 杨粤 房子祎 李平[2] Hong WU;Lei CHEN;Jinpeng HAO;Shitao LIU;Yue YANG;Ziyi FANG;Ping LI(Power Research Institute of State Grid Ningxia Electric Power Co.,Ltd.,Yinchuan,Ningxia 750011,China;State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering,College of Chemistry and Chemical Engineering,Ningxia University,Yinchuan,Ningxia 750021,China;State Grid Ningxia Electric Power Co.,Ltd.,Yinchuan,Ningxia 750001,China)

机构地区：[1]国网宁夏电力有限公司电力科学研究院,宁夏银川750011 [2]宁夏大学化学化工学院,省部共建煤炭高效利用与绿色化工国家重点实验室,宁夏银川750021 [3]国网宁夏电力有限公司,宁夏银川750001

出　　处：《过程工程学报》2023年第7期1054-1062,共9页The Chinese Journal of Process Engineering

基　　金：国网宁夏电力有限公司科技项目(编号:5229DK20004M);宁夏回族自治区国内一流学科建设项目(编号:NXYLXK2017A04)。

摘　　要：瓷绝缘子钢帽腐蚀严重威胁输电线路的安全稳定运行。采用电化学方法考察了瓷绝缘子钢帽在NaHCO_(3)溶液、NaCl溶液和污秽滤液中的腐蚀行为,电化学阻抗谱和极化曲线分析表明,NaHCO_(3)和NaCl溶液对瓷绝缘子钢帽产生的电化学腐蚀速率与溶液浓度呈正相关,钢帽在NaCl溶液中腐蚀速率最大,在污秽滤液中的腐蚀速率随污秽等值盐密增大而增大,其中在高污秽度地区的污秽滤液中腐蚀速率与在低浓度NaHCO_(3)溶液中的腐蚀速率接近;通过腐蚀实验溶液颜色及微观形貌对比可以发现,试样在NaHCO_(3)溶液和污秽滤液中,表面存在腐蚀产物和氧化产物的沉积,而在NaCl溶液中腐蚀表面发生全面腐蚀,且没有出现明显的棕红色Fe(OH)_(3)沉积。因此,高污秽地区绝缘子金属附件的防腐对预防绝缘子失效及防污闪具有重要意义。Porcelain insulator corrosion seriously threatens the safe and stable operation of transmission lines.In this work,the corrosion behavior of porcelain insulator steel caps in NaHCO_(3)solution,NaCl solution,and dust filtrate was investigated by electrochemical method,and the electrochemical impedance spectroscopy and polarization curve analysis showed that the electrochemical corrosion rates of NaHCO_(3)and NaCl solution on porcelain insulator steel caps were positively correlated with the solution concentration,the corrosion rate of steel caps was the largest in NaCl solution,and the corrosion rate in the dust filtrate increased with the increase of pollution equivalent salt density.Among them,the corrosion rate of the filtrate of contamination in the highly polluted degree area was close to that of the low concentration NaHCO_(3)solution.Through the comparison of the color and micromorphology of the corrosion experimental solution,it can be found that there was a deposition of corrosion products and oxidation products on the surface of the sample in NaHCO_(3)solution and dust filtrate,while comprehensive corrosion occurred on the corrosive surface in NaCl solution,and no obvious brown-red Fe(OH)3 deposition occurred.Therefore,the anti-corrosion of insulator metal accessories in highly polluted areas was of great significance to prevent insulator failure and pollution flashover.

关 键 词：电化学腐蚀 电化学阻抗谱 极化曲线 工业污秽 金属附件 

分 类 号：TM216[一般工业技术—材料科学与工程] TM75[电气工程—电工理论与新技术]