铜包钢接地线的腐蚀主要是两方面
The corrosion of copper clad steel grounding wire is mainly in two aspects.
1、外层铜材料的腐蚀
1. Corrosion of outer copper materials
铜包钢外层使用的黄铜材料是铜锌合金，研究表明： 锌在黄铜中属于不稳定状态。铜锌合金Cu-Zn-0. 5Si-1. 5Mg-2. 0Al 的腐蚀速率是41. 916 6 g / ( m2·h) ，腐蚀深度为265 μm［1］； 黄铜在脱锌腐蚀中发生Cu→Cu + + e，在地下富氧态下，产生Cu + +O2→2Cu2O +4Cu2 + 的反应，这种反应在腐蚀土壤环境中还会加剧，因为土壤中存在Cl － ，部分Cu2O 随即形成不稳定的CuCl，加快铜离子在土壤环境中扩散。已使用的铜包钢接地材料在腐蚀后出现蜂窝状腐蚀孔与上述反应机理和描述状况相符。
The brass material used in the outer layer of copper clad steel is copper-zinc alloy. The results show that zinc is unstable in brass. The corrosion rate of copper-zinc alloy Cu-Zn-0.5Si-1.5Mg-2.0Al is 41.916 g/m 2.h, and the corrosion depth is 265 micron [1]. The reaction of Cu Cu + E occurs in the dezincification corrosion of brass, and produces Cu + O 2 2Cu2O + 4Cu 2 + in the oxygen-enriched state of underground, which is aggravated in the corrosive soil environment because of the existence of Cu + O 2 + Cu 2 + in the soil. In Cl, partial Cu2O forms unstable CuCl to accelerate the diffusion of copper ions in the soil environment. The honeycomb corrosion holes of copper clad steel grounding materials after corrosion are consistent with the above reaction mechanism and description.
2、铜材料与内部钢芯之间的电化学腐蚀
2. Electrochemical corrosion between copper material and inner steel core.
在使用铜包钢接地材料的过程中发现，土壤中埋设一段时间的铜包钢会出现绿色和黄褐色附着物，并且部分区段黄铜材料包覆的内部钢芯会腐蚀断裂和出现空心现象。一方面是因为表面黄铜腐蚀形成绿色附着物，另一方面黄铜腐蚀后产生的Cu2O 在石油化工厂潮湿污染的土壤环境下进一步反应，其形成的铜离子( 电位+0. 34V) ，锌离子( 电位－0. 76V) 、钢芯铁离子( 电位－0. 44V) 三者作用的电化学腐蚀，腐蚀速率远远高于纯铜材料的析氧腐蚀。
In the process of using copper clad steel grounding material, it is found that the copper clad steel will appear green and brown adhesives buried in soil for a period of time, and the inner steel core clad with brass material in some sections will corrode and fracture and appear hollow phenomenon. On the one hand, the corrosion of surface brass forms green attachment, on the other hand, the corrosion of brass produces Cu2O which reacts further in the wet and polluted soil environment of petrochemical plants. The electrochemistry of copper ion (potential + 0.34V), zinc ion (potential - 0.76V) and iron ion (potential - 0.44V) formed by the corrosion of surface brass. Corrosion rate is much higher than that of pure copper.