金属体的腐蚀现象大体分为湿腐蚀和干腐蚀两种,埋在地下的管道应列入湿蚀范围。湿蚀又分为由电气铁路及其他物体在地下的泄漏电流引起的电腐蚀和土壤环境引起的自然腐蚀两种。一、电防蚀法的种类和特征电防蚀法根据防蚀电流大体分为动电阳极法、外部电源法、选择排流法及强制排流法。 Corrosion of metal bodies can be roughly divided into wet corrosion and dry corrosion. Pipes buried in the ground should be included in the wet erosion range. Wet erosion is further divided into two categories: electric corrosion caused by leakage currents in the underground of electric railways and other objects, and natural corrosion caused by soil environment. First, the type and characteristics of electrical anti-corrosion method Electrical anti-corrosion method based on the corrosion current is roughly divided into electrodynamic anode method, external power supply method, select drainage method and forced drainage method.