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1 阴极保护时各处电位不相等 受阴极保护的金属表面的电位只有在一定的数值范围以内才能使结构物受到有效的保护。电位过正(“欠保护”)和电位过负(“过保护”)都是应该避免的。不过需要注意的是,在实际工程的阴极保护系统中,无论是牺牲阳极法或外加电流法(也称强制电流法),金属结构物表面的电位以及相应的电流密度并不是到处一样的,即电位和电流分布常常是不均匀的。典型的例子是,埋地长输钢管实施阴极保护采取相隔一定距离的分立布置的辅助阳极,这时靠近阳极的管
1 Cathodic protection is not equal to the potential across the metal surface protected by the cathode potential within a certain range of values in order to make the structure is effectively protected. Potentiometric (“under-protection”) and over-voltage (“over-protection”) should be avoided. However, it should be noted that in the actual project of the cathodic protection system, either at the expense of the anode or applied current method (also known as forced current method), the metal structure of the surface potential and the corresponding current density is not the same everywhere Potential and current distribution is often not uniform. A typical example is the implementation of long-buried steel pipe cathodic protection to take a certain distance apart discrete ancillary anode, then close to the anode tube