CO2对油田地下水环境中Q235钢和X70钢腐蚀行为的影响

doi:10.13251/j.issn.0254-6051.2020.06.047

金属热处理 ›› 2020, Vol. 45 ›› Issue (6): 226-231.DOI: 10.13251/j.issn.0254-6051.2020.06.047

CO₂对油田地下水环境中Q235钢和X70钢腐蚀行为的影响

王月¹, 王丹¹, 谢飞¹, 王兴发¹, 郭紫薇¹, 朱芯坤²

1. 辽宁石油化工大学石油天然气工程学院, 辽宁抚顺 113001;
2. 青海油田采气一厂, 青海格尔木 816000

收稿日期:2019-12-15 出版日期:2020-06-25 发布日期:2020-09-02
通讯作者: 谢飞,博士,副教授,E-mail:xiefei0413@163.com
作者简介:王月(1996—),女,硕士研究生,主要研究方向为油气管道腐蚀与防护,E-mail:2575618302@qq.com。
基金资助:
国家自然科学基金(51604150);辽宁省自然科学基金指导计划(20180550669);辽宁省“兴辽英才计划”(XLYC1807260)

Effect of CO₂ on corrosion behavior of Q235 steel and X70 steel in oilfield groundwater environment

Wang Yue¹, Wang Dan¹, Xie Fei¹, Wang Xingfa¹, Guo Ziwei¹, Zhu Xinkun²

1. School of Petroleum Engineering, Liaoning Shihua University, Fushun Liaoning 113001, China;
2. No.1 Gas Production Plant of Qinghai Oilfield, Golmud Qinghai 816000, China

Received:2019-12-15 Online:2020-06-25 Published:2020-09-02

摘要/Abstract

摘要： 为了探明辽河油田地下水环境中CO₂对Q235钢和X70管线钢的腐蚀规律,采用动电位极化技术及交流阻抗技术研究了不同CO₂浓度对该环境下两种钢腐蚀行为的影响,并利用光学显微镜对试样腐蚀界面进行表征。结果表明:随着CO₂浓度的增加,Q235和X70钢的交流阻抗图谱的半径均减小,腐蚀电流密度增大,腐蚀坑数量、深度和面积都增加,腐蚀敏感性增大。在低浓度CO₂环境下(CO₂含量为10%时),Q235钢的腐蚀敏感性比X70钢更高;而在高浓度CO₂环境下(CO₂含量为20%、40%、60%时),Q235钢的腐蚀速率反而较小,耐腐蚀性更好。

关键词: 地下水环境, X70钢, Q235钢, CO₂浓度, 耐腐蚀性

Abstract: In order to find out the corrosion law of CO₂ on Q235 steel and X70 pipeline steel in the groundwater environment of Liaohe Oilfield, the effects of different CO₂ concentrations on corrosion behaviors of the two steels were investigated by using of potentiodynamic polarization technique and AC impedance technique. The corrosion interface of the specimens was characterized by means of metallographic microscope. The results show that with the increase of CO₂concentration, the radius of the AC impedance spectrum of the two steels decreases, the corrosion current density increases; the number, depth and area of corrosion pits increase, and the corrosion sensitivity increases. In low concentration CO₂environment (such as 10% CO₂), Q235 steel has higher corrosion sensitivity than that of X70 steel. And in high concentration CO₂ environment (such as 20%, 40%, 60%), the corrosion rate of Q235 steel is smaller and the corrosion resistance is better.

Key words: groundwater environment, X70 steel, Q235 steel, CO₂ concentration, corrosion resistance

中图分类号:

TG172

王月, 王丹, 谢飞, 王兴发, 郭紫薇, 朱芯坤. CO₂对油田地下水环境中Q235钢和X70钢腐蚀行为的影响[J]. 金属热处理, 2020, 45(6): 226-231.

Wang Yue, Wang Dan, Xie Fei, Wang Xingfa, Guo Ziwei, Zhu Xinkun. Effect of CO₂ on corrosion behavior of Q235 steel and X70 steel in oilfield groundwater environment[J]. Heat Treatment of Metals, 2020, 45(6): 226-231.

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CO₂对油田地下水环境中Q235钢和X70钢腐蚀行为的影响

Effect of CO₂ on corrosion behavior of Q235 steel and X70 steel in oilfield groundwater environment

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