前言对于埋地输油管道,世界各国都普遍采用防腐层加阴极保护双重保护体系以防止输油管道的腐蚀。通过对阴极保护的电性能参数的检查,可以比较科学地鉴定阴极保护效果。国内外都明确规定了标志管道是否受到保护的保护电位范围,为此,保护电位的测定已成为管道防腐管理的主要手段和主要指标之一,所以必需随时了解、控制与测试管 Preface For the buried pipeline, the coating and cathodic protection double protection system is generally adopted in all countries in the world to prevent the pipeline corrosion. By examining the electrical performance parameters of the cathodic protection, the cathodic protection effect can be scientifically identified. For this reason, the determination of protective potential has become one of the main means and main indexes for the anticorrosive management of pipelines. Therefore, it is necessary to keep abreast of the control and test tubes