新型接地材料在汕头土壤浸出液中的腐蚀电化学行为

Corrosion electrochemical behavior of novel grounding material in soil leaching liquor in Shantou

[目的]研究导电高分子基复合接地材料在汕头地区变电站土壤浸出液中的腐蚀电化学行为,为导电高分子基复合接地材料的服役寿命和工程设计提供理论参考与数据支撑。[方法]通过开路电位、动电位极化曲线、电化学阻抗谱等电化学测试,对比研究了不同接地材料在汕头土壤浸出液中的腐蚀电化学行为。[结果]与20钢和镀锌钢相比,导电高分子基复合接地材料的腐蚀电位最正,腐蚀电流密度最低,低频阻抗模值最大。不同接地材料在汕头土壤浸出液中的耐腐蚀性能大小排序为:导电高分子基复合接地材料>镀锌钢> 20钢。[结论]导电高分子基复合接地材料在汕头土壤浸出液中的耐蚀性明显高于20钢与镀锌钢。

[Introduction]The corrosion electrochemical behavior of conductive polymer based composite grounding material in soil leaching liquor of the substation in Shantou region was studied to provide theoretical reference and data support for the service life prediction and engineering design of conductive polymer based composite grounding materials.[Method]The corrosion electrochemical behaviors of some grounding materials in soil leaching liquor of Shantou were studied by open circuit potential measurement,potentiodynamic polarization curve measurement,and electrochemical impedance spectroscopy.[Result]The conductive polymer based composite grounding material had a more positive corrosion potential,a lower corrosion current density,and a higher low-frequency impedance magnitude than 20 steel and hot-dip zinc-coated steel.The corrosion resistance of different grounding materials was in the following descending order:conductive polymer based composite grounding material>hot-dip zinc-coated steel>20 steel.[Conclusion]The conductive polymer based composite grounding material has a much higher corrosion resistance than 20 steel and hot-dip zinc-coated steel in the soil leaching liquor of Shantou.