模拟了河南典型土壤介质环境，研究了典型“金属引下线（镀锌钢）-石墨接地网”之间的电偶腐蚀行为。结果表明：在模拟土壤介质工况条件下，金属引下线和石墨接地网之间的电位差约为700 mV，具有显著电偶腐蚀倾向，其中，引下线镀锌钢的自腐蚀电位更负，为电偶腐蚀阳极，腐蚀进程将被加速；电导率和含氧量对这两种材料间的电偶腐蚀行为均有显著影响；随着电导率和含氧量的升高，电偶电流密度均增大，在含氧量15%和电导率1 000 μS/cm条件下，相比无偶接试样，其电偶腐蚀加速倍率分别达到13.36和5.18，电偶加速效应明显；面积比的升高对电偶腐蚀也具有明显的促进作用；本研究条件下上述两种材料间的电偶腐蚀敏感性等级均达到最高级E级。在新型石墨接地网装置中，镀锌钢引下线存在较高电偶腐蚀风险，在实际使用中应尽量避免上述两种材质的组合，在无法避免的情况下，应对其采取合理的防护措施。

The typical soil medium environment in Henan was simulated, and the galvanic corrosion behavior between the typical "metal downconductor (galvanized steel)-graphite grounding grid" was studied. The results showed that the potential difference between the metal downconductor and the graphite grounding grid reached about 700 mV under the simulated soil medium conditions, which had a significant tendency of galvanic corrosion. Among them, the self-corrosion potential of the downconductor galvanized steel was more negative, and it was the anode of the galvanic corrosion, and the corrosion process would be accelerated; the electrical conductivity and oxygen content had significant effects on the galvanic corrosion behavior between these two materials. With the increase of electrical conductivity and oxygen content, the galvanic current density increased. Compared with the uncoupled samples under the conditions of 15% oxygen content and 1000 μS/cm conductivity, the galvanic corrosion acceleration rate reached 13.36 and 5.18, respectively, and the galvanic acceleration effect was obvious; the increase of the area ratio also had a significant promoting effect on the galvanic corrosion; the galvanic corrosion susceptibility grade between the above two materials reached the highest grade E under the conditions of this study. In the new graphite grounding grid device, the galvanized steel down-conductor had a high risk of galvanic corrosion. In actual use, the combination of the above two materials should be avoided as much as possible. If it was unavoidable, reasonable protective measures should be taken.