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高温高压下Cl^-浓度、CO₂分压对13Cr不锈钢点蚀的影响

Effects of CI^- Concentration and CO₂ Partial Pressure on Pitting Behavior of 13Cr Stainless Steel under High Temperature and High Pressure

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【Author】 LV Xiang-hong~1 ,ZHAO Guo-xian~2 , FAN Zhi-hal~2 , YANG Yan-qing~1 , CHEN Chang-feng~3 , LU Min-xu~3 ( 1. College of Material Science and Engineering, Northwestern Polytechnical University,XiAn 710072; 2. Tubular Goods Research Center of CNPC, Xi’an 710065; 3. University of Science and Technology Bei Jing,Bei Jing 100083, China)

【机构】西北工业大学材料科学与工程学院；中国石油天然气集团公司管材研究所；北京科技大学腐蚀与防护中心；北京科技大学腐蚀与防护中心陕西西安710072；陕西西安710065；陕西西安710072；北京100083；北京100083；

【摘要】为了研究CO2 分压、Cl-浓度对 13Cr油井管钢点蚀行为的影响 ,用电化学方法模拟塔里木油田环境进行了腐蚀试验。结果表明 ,在模拟条件下 ,13Cr钢的再钝化能力较差 ;Cl-是造成 13Cr钢发生孔蚀的主要原因 ,在较高Cl-浓度下 ,点蚀诱发敏感性增强 ,EIS图谱的低频端出现典型的点蚀诱导期和发展期特征 ;随着CO2 分压的增大 ,促使孔蚀的发生和发展 ,蚀孔内的阳极反应电流密度加强 ,溶液黏度加大 ,从而使蚀孔内的扩散传质过程受阻更多还原

【Abstract】 Pitting behaviors of 13Cr stainless steel were studied in the stimulated environment of Talimo oil field by electrochemical method. The results show that the re-passivation ability of 13Cr stainless steel is worse, and C1^- is the main factor for pitting initiation. Under the condition of higher C1^- concentration the susceptibility to pitting initiation increases, and the characteristics of pitting initiation and propagation appear on the low-frequency part of EIS. As the CO₂ partial pressure increases, the pitting initiation and propagation are accelerated, and then the mass transport process in the inner of pits is retarded because the anodic current density increases greatly resulted in increase of viscosity.更多还原