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阴极保护的作用原理电缆埋在地下,其同轴中性线,即电缆外层的铠甲就开始锈蚀,这种锈蚀现象在地面上看不见,并不引起人们的重视。但锈蚀引起的损害是确实存在的,而且一旦发生损坏,将造成严重的经济损失。电气设备的接地装置,由于不同金属连在一起,其作用就象一个巨大的原电池,即所谓的锈蚀电池,其中某种金属被锈蚀,而另一种金属得到保护。即使是同一种金属埋在地下,如果土壤各处的电阻率发生变化,某一部分金属也会发生锈蚀(见图1～2)。
The principle of cathodic protection Cable buried in the ground, the coaxial neutral line, that is, the outer armor of the cable began to rust, the rust phenomenon can not be seen on the ground, does not arouse people’s attention. However, the damage caused by corrosion does exist, and in the event of damage, it will cause serious economic losses. Electrical equipment, grounding device, due to the different metals together, its role as a huge primary battery, the so-called rusty batteries, in which a metal is corroded, while the other metal is protected. Even if the same metal is buried underground, some of the metal will rust if the resistivity varies throughout the soil (see Figures 1-2).