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一、前言地下管线的防腐蚀一般采用涂层及阴极保护方法，涂层是主要的保护措施，阴极保护是一种辅助措施。涂层破损越严重，对阴极保护系统的要求就越高。由于人为或环境因素，在安装管线时，就可能出现涂层破损，增加阴极保护电流输出量，不一定能达到要求的保护，在一些情况
I. Introduction Prevent corrosion of underground pipelines generally adopts coating and cathodic protection methods. The coating is the main protective measure and the cathodic protection is an auxiliary measure. The more damaged the coating, the higher the requirements for the cathodic protection system. Due to man-made or environmental factors, coating damage may occur during installation of the pipeline to increase the output current of the cathodic protection current and may not necessarily achieve the required protection. In some cases