对库鄯输油管道阴极保护投运的认识

库鄯输油管道沿线不同的地形地貌和土壤分布造成对管道腐蚀性的差异。埋地管道表面在不同部位间存在的电位差是引起金属表面土壤腐蚀的主要原因。介绍了沿线土壤腐蚀环境及库鄯输油管道阴极保护系统的设计、施工及调试情况。阴极保护系统采用强制电流和牺牲阳极两种保护形式。在高电阻率的石方段采用伴随管道同沟敷设的柔性辅助阳极；在山区段采用带状和块状的镁阳极做牺牲阳极。该系统调试运行正常，应用效果良好。由于近年来的输油

Recognition of the start-up of Kushan oil pipeline's cathodic protection

There are different corrosion behaviors to Kushan oil pipeline due to various topographical ground features and soil distribution along the pipeline. Potential difference existed at different locations on the surface of buried pipeline is the major reason to cause metal surface corrosion. The article introduces a corrosive environment of the soil on the line and design,construction and test of Kushan oil pipeline's cathodic protection system which adopts impressed current and sacrificial anode for corrosion protection. In stonework segment with high resistivity,flexible auxiliary anode buried in the same ditch with the pipeline is used; in mountain segment,strip or block magnesium anode is used as sacrificial anode. The system operates normally during test period and shows a good result in application. The article puts forward that as high quality coatings with good properties is tend to be used for oil transporting pipelines in recent years, determination of the parameters such as coating's surface resistance and max. protective potential value shall be get through test. As the soil in most segments has high salinity,test on pipelin's protective potential shall be made frequently in rainy season.