红壤中变电站接地网金属材料的腐蚀行为分析

发布时间：2018-10-31 15:21

【摘要】：采用扫描电镜(SEM)、能谱(EDS)和X射线衍射(XRD)等技术对红壤中变电站接地网服役长达13 a的镀锌扁钢进行了形貌分析和腐蚀产物分析。结果表明,该镀锌扁钢受到严重腐蚀,腐蚀产物主要由Fe OOH,Fe3O4和Fe2O3等组成,腐蚀产物分层的原因是新生成的腐蚀产物沉积在金属/腐蚀产物层界面或腐蚀产物开裂处,同时S和Cl对内层腐蚀产物具有较大的影响。Tafel测试结果表明,在腐蚀电流峰值附近,SO42-与Cl-的百分比为1∶2时,两者对镀锌Q235碳钢在该红壤中的腐蚀性影响具有等效作用。通过室内加速实验模拟镀锌Q235碳钢在该红壤中的腐蚀发现,镀锌Q235碳钢的腐蚀速率呈现先增大后减小的规律,该加速实验在未改变镀锌Q235碳钢腐蚀机理的同时具有较好的加速效果。
[Abstract]:The morphology and corrosion products of galvanized flat steel with grounding grid of substation in red soil for 13 years were analyzed by scanning electron microscope (SEM),) (EDS) and X-ray diffraction (XRD) techniques. The results show that the galvanized flat steel is seriously corroded and the corrosion products are mainly composed of Fe OOH,Fe3O4 and Fe2O3. The reason of the new corrosion products is that the corrosion products are deposited at the interface of the metal / corrosion products or the corrosion products crack. At the same time, S and Cl have great influence on the corrosion products of inner layer. The results of Tafel test show that the percentage of SO42- and Cl- is 1:2 near the peak value of corrosion current. Both of them have an equivalent effect on the corrosion of galvanized Q235 carbon steel in the red soil. The corrosion of galvanized Q235 carbon steel in the red soil was simulated by accelerated experiments in laboratory. It was found that the corrosion rate of galvanized Q235 carbon steel increased first and then decreased. The accelerated experiment has good acceleration effect without changing the corrosion mechanism of galvanized Q235 carbon steel.
【作者单位】：长沙理工大学化学与生物工程学院;国网湖南省电力公司电力科学研究院;
【基金】：国家电网公司总部科技项目(KG12K16004)资助
【分类号】：TG172.4

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