油田集输系统中电偶腐蚀的影响因素与防治措施分析  

Influence Factors and Prevention Measures of Galvanic Corrosion in Oil & Gas Gathering System

作　　者：李循迹[1] 宋文文[1] 周理志[1] 毛仲强[1] 李岩[1] 田鹏[1] 秦振杰[1] 王鹏[1] 

机构地区：[1]中国石油塔里木油田分公司,新疆库尔勒841000

出　　处：《材料保护》2017年第1期82-85,共4页Materials Protection

摘　　要：为避免电偶腐蚀引起的油气田集输系统腐蚀穿孔,分析了油气田集输系统中影响电偶腐蚀速度的异种金属的材料特性、几何尺寸和腐蚀环境等因素,提出了电偶腐蚀的等效电路。分析结果表明:电偶腐蚀速度和局部腐蚀位置与耦合后的极化电位差、电偶腐蚀回路总电阻、电偶腐蚀电流在阳极侧的作用面积大小密切相关;在工程实践中采用绝缘电阻大于10 MΩ的异金属绝缘法兰是一种原理可靠、技术可行、经济合理、效果显著的防治措施。Influence factors of galvanic corrosion in oil ＆ gas gathering system, including material properties of dissimilar metals, geometrical size and corrosive environment were analyzed, and the equivalent circuit of galvanic corrosion was proposed as well. Results showed that galvan- ic corrosion rate was closely related to the following factors ： localized corrosion position, polarization potential differences after dissimilar metals coupling, total resistance of galvanic corrosion loop, and effective action area of galvanic corrosion current in the anode side. In the engineering practice, utilizing the insulating flange （insulating resistance 〉 10 MΩ） to prevent galvanic corrosion in dissimilar metals joint was a principle- reliable, technology-feasible, economical, and significantly effective measure.

关 键 词：油气集输 电偶腐蚀 等效电路 极化电位差 有效阳极面积 绝缘法兰 

分 类 号：TE988[石油与天然气工程—石油机械设备]