As to the underground metallic facilities with certain lengths, the electro-corrosion impacts on them should be calculated according to actual situation.
对于具有一定长度的地下金属设施，由于相关参数差异性较大，需根据实际情况进行计算。
2
Corrosion is an electro-chemical process by which a metal such as mild steel ,returns to its natural state ,state ,such as iron oxide or rust.