期刊论文

Corrosion Effect of SO_4~(2-) and DC Stray Current on Three Kinds of Grounding Grid Materials in Soil

中文

材料保护

1001-1560

2019

52

7

67-74,89

10.16577/j.cnki.42-1215/tb.2019.07.014

湖南省科技计划重点项目（2013GK2016）资助；

本校为第一机构

目前,对接地网材料在直流杂散电流和含SO_4~(2-)土壤联合作用下腐蚀行为的研究鲜见报道。通过失重法、电化学试验、扫描电镜(SEM) 、X射线衍射仪(XRD) 、能谱分析仪(EDS)等,研究了SO_4~(2-)浓度为0.05%、0.10%、 0.20%、0.50%与直流杂散电流为10,25,40 mA时3种接地网材料(铜、Q235镀锌扁钢、Q235扁钢)在土壤中的腐蚀特性。交流阻抗谱表明直流杂散电流的大小影响金属电极材料阴、阳极反应的传质方式和响应频率,土壤中SO_4~(2-)含量的大小只影响电极材料阴、阳极的传质速率。直流杂散电流产生的电场能使SO_4~(2-)定向迁移,杂散电流越大,扩散过程增强,接地网材料失重速率也越大,且与SO_4~(2-)含量呈...

At present,the corrosion behavior of grounding grid materials under the combined action of DC stray current and SO_4~(2-) in soil is rarely reported. The corrosion characteristics of three kinds of grounding grid materials were investigated by means of mass-loss method,electrochemical experiments,scanning electron microscope(SEM),X-ray diffractometer(XRD) and energy spectrum analyzer (EDS) under the different concentrations of SO_4~(2-) (0.05%,0.10%,0.20%,0.50%) and different DC stray currents (10,25,40 mA) in soil. The electrochemical impedanc...