| CO2对油田地下水环境中Q235钢和X70钢腐蚀行为的影响 |
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| 引用本文： | 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. |
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| 作者姓名： | 王月 王丹 谢飞 王兴发 郭紫薇 朱芯坤 |
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| 作者单位： | 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 |
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| 基金项目： | 辽宁省自然科学基金;国家自然科学基金;辽宁省兴辽英才计划项目 |
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| 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。
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| 关 键 词： | 地下水环境 X70钢 Q235钢 CO2浓度 耐腐蚀性 |
| 收稿时间： | 2019-12-15 |
Effect of CO2 on corrosion behavior of Q235 steel and X70 steel in oilfield groundwater environment |
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| 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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| Authors: | Wang Yue Wang Dan Xie Fei Wang Xingfa Guo Ziwei Zhu Xinkun |
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| Affiliation: | 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 |
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| 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 CO2 concentration, 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 CO2 environment (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. |
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| Keywords: | groundwater environment X70 steel Q235 steel CO2 concentration corrosion resistance |
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