交流杂散电流对变电站接地装置腐蚀电化学行为的影响  

Effect of AC Stray Current on Electrochemical Corrosion Behavior of Substation Grounding Device

作　　者：刘军[1] 杨道武[1] 吴道新[1] 任振兴[1] 庄玉琴[1] 马永[1] 

机构地区：[1]长沙理工大学化学与生物工程学院电力与交通材料保护湖南省重点实验室,湖南长沙410114

出　　处：《材料保护》2015年第10期45-47,8-9,共3页Materials Protection

基　　金：湖南省科技攻关项目(2010CK3020);长沙市科技攻关项目(K1104029-11);电力与交通材料保护专项基金项目(20110006)资助

摘　　要：目前,关于变电站土壤中的交流杂散电流对接地材料腐蚀的影响报道较少,对其腐蚀机理、评判标准的研究也不够深入。在室内模拟了变电站接地土壤中杂散电流对其装置材料Q235钢的腐蚀,采用电化学方法研究了土壤交流杂散电流密度、通电时间、土壤酸碱度及交流电频率等对Q235钢交流杂散电流腐蚀行为的影响。结果表明:变电站接地金属的腐蚀随交流电流密度的增大而增强,随通电时间的增大先增强后减弱;酸性环境加速接地金属交流杂散电流腐蚀,且酸性越强,腐蚀越严重;碱性环境阻碍交流杂散电流腐蚀,当p H>9时,金属表面生成保护膜,较大程度抑制腐蚀;交流电频率的微弱改变对交流杂散电流腐蚀影响很小。Indoor corrosion tests of Q235 steel used for the substation grounding device caused by stray current were carried out,and the influences of AC current density,power-on time,soil pH value and AC frequency on the AC stray current corrosion process were researched by electrochemical analysis techniques.Results showed that the corrosion of the substation grounding metal was aggravated with the increase of AC current density,and the corrosion rate firstly increased and then decreased with the increase of power-on time.Besides,the acidic environment worsened the corrosion while the alkaline environment hindered the corrosion caused by stray current.When the pH value was above 9,the protective film on the metal surface was formed,which inhibited the corrosion greatly.Finally,the small change of AC frequency had minor effect on the corrosion of grounding metals.

关 键 词：交流杂散电流腐蚀 变电站接地装置 Q235钢 电化学行为 

分 类 号：TM63[电气工程—电力系统及自动化] TG142.1[一般工业技术—材料科学与工程]