取安徽省八座500 kV变电站土壤按水土比1∶1配制试验介质, 对铜质接地网材料进行电化学测试和极化曲线测试, 结果表明, 铜质接地网材料在试验介质中的腐蚀均属于活化控制, 没有明显的氧扩散控制; 电化学阻抗谱测试结果表明, 铜质接地网材料在试验介质中浸泡4 h, 反应只受电极溶解控制。

Electrochemical tests of copper grounding grid material were carried out in eight 500 kV substations in Anhui province, using the electrolyte of water∶soil=1∶1. The polarization curves indicated that the corrosion rate of copper grounding grid material was mainly affected by the rate of electron diffusion, not by oxygen diffusion. The electrochemical impedance spectroscopy of copper material showed that, after immersion in the electrolyte of water∶soil=1∶1 for 4 hours, the corrosion rate of copper grounding grid material was only affected by the dissolution rate of the working electrode.