交流杂散电流对变电站接地装置腐蚀电化学行为的影响

发布时间：2018-01-31 19:09

本文关键词： 交流杂散电流腐蚀变电站接地装置 Q钢电化学行为　出处：《材料保护》2015年10期 　论文类型：期刊论文

【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 H9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。
[Abstract]:At present, there are few reports about the effect of AC stray current in substation soil on grounding material corrosion, and the corrosion mechanism is also discussed. The corrosion of stray current in substation ground soil to Q235 steel was simulated in laboratory, and the soil AC stray current density was studied by electrochemical method. The effect of electrification time, soil pH and AC frequency on AC stray current corrosion behavior of Q235 steel is investigated. The results show that the corrosion of grounding metals in substations increases with the increase of AC current density. With the increase of the time of electrification, it first increases and then weakens. The acid environment accelerates the AC stray current corrosion of grounding metal, and the stronger the acidity, the more serious the corrosion. Alkaline environment hinders AC stray current corrosion, when pH 9, metal surface protection film, a large degree of corrosion inhibition; The weak change of AC frequency has little effect on AC stray current corrosion.
【作者单位】：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;
【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
【分类号】：TM63;TG142.1
【正文快照】： 0前言变电站接地装置一般敷设于地面下方0.3~0.8 m土壤中,除受到土壤的化学腐蚀和电化学腐蚀外,土壤中的杂散电流及泄漏电流也会对其造成很严重的腐蚀。常采取阴极保护、导电涂层或两者联合的方法[1,2]保护变电站的接地金属,但都不能从根本上防止杂散电流的腐蚀。目前,国内外

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