试片断电法在管道阴极保护中的应用  

Application of coupon OFF method in cathodic protection system of pipeline

作　　者：张丰[1] 齐晓忠 金宏 刘迎春 薛致远[1] 陈洪源[1] 

机构地区：[1]中国石油管道科技研究中心中国石油天然气集团公司油气储运重点试验室,河北廊坊065000 [2]中国石油昆仑燃气有限公司,北京100038 [3]中国石油管道公司郑州输油气分公司,河南郑州450000

出　　处：《油气储运》2013年第7期760-763,共4页Oil & Gas Storage and Transportation

摘　　要：应用试片断电法对管道开展3次管道阴极保护有效性评价试验,并将检测结果与恒电位仪瞬时同步中断法测量的断电电位进行对比。结果表明:对于不同的管道涂层类型、涂层状况及测量点位置,测试结果呈现不同的规律。采用静电场理论探讨了基于极化试片的辅助试片断电法测得的断电电位的真实意义,结果表明:对于特定面积的极化试片,测量的断电电位介于管/地通电电位和试片自然电位之间;特定大小电极面积的试片无法适用于所有条件下的测量,电极面积需根据管道涂层类型、涂层状况及测量点位置进行调整,通过数值模拟对试片断电法测量断电电位的基本规律进行计算验证。有关结论也适用于极化探头断电法。3 effectiveness evaluation tests with coupon OFF method are carried out. The authors compare the test results with OFF potential measured by instantaneous synchronization OFF method with a potentiostat. The results show that for different types of pipe coating, coating condition and measuring point location, test results will appear different laws. A discussion is made on the real significance of the OFF potential measured by auxiliary coupon OFF method based on polarized coupon with electrostatic field theory. The conclusion is that for polarized coupon with particular area, the measured potentials are between the pipe/soil ON potential and natural potential of the coupon, the coupon with certain electrode size can not apply to the measurement under all conditions. The electrode area should be adjusted according to the type of pipe coatings, coating conditions and measuring point location, and calculation verification should be performed for basic law of OFF potential measured by the coupon OFF method through numerical simulation. The relevant conclusions are also applicable to the polarized probe OFF method. （2 Tables, 3 Figures, 6 References）

关 键 词：阴极保护 断电电位 数值模拟 

分 类 号：TE988[石油与天然气工程—石油机械设备]