流动NaCl溶液中P110钢的电化学腐蚀行为  

Electrochemical Corrosion Behavior of P110 Steel in Flowing NaCl Solution

作　　者：程嘉瑞[1,2] 晏琦琪 乔帆帆 魏文澜 CHENG Jiarui;YAN Qiqi;QIAO Fanfan;WEI Wenlan(Xi'an Key Laboratory of Wellbore Integrity Evaluation,Xi'an Shiyou University,Xi'an 710065,China;CNPC National Engineering Research Center for Oil Gas Drilling Equipinent Co.,Ltd.,Baoji 721015,China)

机构地区：[1]西安石油大学西安市高难度复杂油气井完整性评价重点实验室,西安710065 [2]国家油气钻井装备工程技术研究中心有限公司,宝鸡721015

出　　处：《腐蚀与防护》2022年第7期87-91,121,共6页Corrosion & Protection

基　　金：国家自然科学基金(52105209)。

摘　　要：利用循环流动试验装置,进行了多点在线电化学腐蚀参数测量,分析了P110钢在流动NaCl溶液中的电化学腐蚀行为,讨论了流速和NaCl浓度对P110钢腐蚀行为的影响。结果表明:在流动的2%(质量分数)NaCl溶液中,随着流速的增大P110钢的腐蚀速率升高,该过程中腐蚀反应主要由阴极氧扩散和阳极溶解反应共同控制;在高流速NaCl溶液中,液体对壁面的剪切力和Cl^(-)共同作用破坏了腐蚀产物膜,导致Cl^(-)浓度升高后电荷传递电阻持续减小,腐蚀速率增大。Using a circulating flow experimental device,multi-point online electrochemical corrosion parameters were measured,the electrochemical corrosion behavior of P110 steel in flowing NaCl solution was analyzed,and the effects of flow rate and NaCl concentration on the corrosion behavior of P110 steel were discussed.The results showed that in flowing 2%(mass fraction)NaCl solution,the corrosion rate of P110 steel increased with the increase of flow rate,and the corrosion reaction was mainly controlled by cathodic oxygen diffusion and anodic dissolution reaction.In high flow rate NaCl solution,the shear force of the liquid on the wall and the action of Cl^(-)worked together to destroy the corrosion product film,resulting in the continuous decrease of the charge transfer resistance and the increase of the corrosion rate after the increase of the Cl^(-)concentration.

关 键 词：P110钢 流动介质 NACL溶液 电化学腐蚀 

分 类 号：TE38[石油与天然气工程—油气田开发工程]