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一、阴极保护效果阴极保护是世界各国广泛采用的一项有效防腐措施。它的特点是结构简单、管理方便、保护效果好。也是防腐措施中最经济可靠的方法之一。阴极保护用于我国石油管线已有二十多年,对延长管线使用寿命已有显著效果。通过实验与实践,地下金属管线要达到有效的保护程度,就必须使外加电流把被保护的管线极化到与管线阳极区段的开路电位相等,使阳极区段没有电流流出,才能抑制管线金属离子落入土壤,这样就必须把外加于管线的电流达到一定的电流密度,或使管线建立一定的管地电位。1.最小电流密度:使管线得到充分保护的外加电流密度,保护电流密度决定总保护电
First, the cathodic protection Cathodic protection is widely used in various countries in the world an effective anti-corrosion measures. It is characterized by simple structure, easy management, good protection effect. It is also one of the most economical and reliable methods of anticorrosive measures. Cathodic protection has been used in China’s oil pipelines for more than 20 years, which has had a significant effect on extending the service life of pipelines. Through experiments and practices, in order to achieve effective protection of underground metal pipelines, it is necessary to apply an external current to protect the pipeline to be equal to the open circuit potential of the anode section of the pipeline so that no current flows out of the anode section to suppress the metal Ions fall into the soil so that the current applied to the pipeline must reach a certain current density or establish a certain pipe potential. 1. The minimum current density: the pipeline is fully protected by the additional current density, the protection of the current density determines the total protection of electricity