碳钢在CO2与Cl-介质交互作用下腐蚀行为研究
Research on corrosion behavior of carbon steel under the interaction between CO2 and Cl
王锦昌 1魏开鹏 1马俊杰2
作者信息
- 1. 中石化华北油气分公司石油工程技术研究院,河南郑州 450006
- 2. 中国石油长庆油田分公司第三采油厂,宁夏银川 750000
- 折叠
摘要
主要研究了 20号碳钢管线材料在包含CO2和不同Cl-浓度的溶液体系中的腐蚀行为.通过采用电化学、化学浸泡法以及一系列表征技术,从多角度分析了 Cl-与CO,共同作用对管线材料腐蚀行为的影响.试验结果表明:在Cl-溶液体系中,碳钢的腐蚀速率呈现出相对较低的数值,且随着Cl-浓度的增加,其腐蚀速率呈现先增大后趋于平缓的趋势;当Cl-与CO2两种介质共同作用时,将导致碳钢腐蚀速率显著增加.从电化学试验角度来看,阻抗与极化测试结果均与浸泡测试得到的腐蚀速率的结果相一致,阻抗和极化测试结果表明Cl-与CO2两者共同作用可以使得碳钢容抗弧半径显著减小,并伴随着腐蚀电流密度的显著增加.
Abstract
The paper focus on the corrosion behavior of No.20 carbon steel pipeline material in solution system containing CO2 and different concentration of Cl-.The influence of combined action of Cl-and CO2 on corrosion behavior of pipeline material was analyzed by applying electrochemistry testing,chemical immersion as well as a series of characterization techniques.The ex-perimental results revealed that the corrosion rate of carbon steel shows a relatively low value in Cl-solution system.And with the increase of Cl-concentration,the corrosion rate shows an upward trend at first and then tends to be gentle.The combined effect of Cl-and CO2 will significantly increase the corrosion rate of carbon steel.From the perspective of electrochemical testing,im-pedance and polarization testing results are consistent with corrosion rate results of immersion testing.Impedance and polarization testing results indicated that the combined effect of Cl-and CO2 can remarkably reduce arc radius of carbon steel capacitive re-actance,accompanied by a considerable increase in corrosion current density.
关键词
氯离子/CO2/碳钢/腐蚀速率/电化学腐蚀/交互作用Key words
chloride ion/CO2/carbon steel/corrosion rate/electrochemical corrosion/interaction引用本文复制引用
基金项目
中国石化油田勘探开发事业部采油气导向项目(TTBXD-SYGC-2023-3-02-004)
出版年
2024
NETL
NSTL
万方数据