Sacrificing anode cathodic protection technology

Sacrificial anode cathodic protection technology is to use a metal or alloy with a potential more negative than the metal to protect the metal electrically connected with the protected metal, relying on the negative potential of the metal corrosion and dissolution of the current to protect other metals. Advantages: A: The primary investment cost is low, and the maintenance cost is basically not required in the operation process B: the utilization rate of protection current is high, and no overprotection will occur C: It has no interference influence on the adjacent underground metal facilities, and is suitable for the protection of the plant and the long-distance transmission pipelines without power supply, as well as small-scale scattered pipelines D: E: The construction technology is simple, and there is no need for special professional maintenance and management. Disadvantages: A: low driving potential, narrow protection current regulation range, small protection range B: the range of use is limited by the soil resistivity, that is, when the soil resistivity is greater than 50 ω.m, it is generally not suitable to use sacrificial anode protection law C: in the presence of strong stray current interference area, especially under AC interference, the anode performance may be reversed D: The effective cathodic protection life is limited by the sacrificial anode life, which needs to be replaced regularly