The CO2 corrosion behaviour of 25Mn2 and 2Cr steels under certain downhole condition

Corrosion Engineering, Science and Technology: The International Journal of Corrosion Processes and Corrosion Control Pub Date : 2024-01-12 DOI:10.1177/1478422x231212960

Yuling Zhang, Qingchao Tian, Deng Xuyan, Xiao Xu, Wang Guofu

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Abstract

An economical 2Cr steel tubing was prepared for application in a certain downhole corrosion condition, and the CO2 corrosion behaviour was investigated by employing the 25Mn2 steel for comparative study. The corrosion films of the two steels under different corrosion conditions were analysed by optical microscope, scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). It is revealed that the corrosion rate of 25Mn2 steel at static solution is about 2.5 times higher than that at the dynamic solution with the flow velocity of 1 m/s, while the corrosion rate of 2Cr steel keeps almost the same. It is found that both steels show two layers of corrosion film at static corrosion, and the corrosion film is mainly composed of FeCO3, α-FeOOH and dotted Fe3C in the inner layer. It is inferred that carbon pickup phenomenon observed in the corrosion film is attributed to the formation of FeCO3, as well as may also be due to phenomenologically the reaction of Fe3C with carbonic acid.

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25Mn2 和 2Cr 钢在特定井下条件下的二氧化碳腐蚀行为

制备了一种适用于特定井下腐蚀条件的经济型 2Cr 钢管，并采用 25Mn2 钢对二氧化碳腐蚀行为进行了对比研究。通过光学显微镜、扫描电子显微镜（SEM）、能量色散光谱仪（EDS）和 X 射线衍射仪（XRD）分析了两种钢在不同腐蚀条件下的腐蚀膜。结果表明，25Mn2 钢在静态溶液中的腐蚀速率是流速为 1 m/s 的动态溶液中腐蚀速率的约 2.5 倍，而 2Cr 钢的腐蚀速率几乎保持不变。研究发现，两种钢在静态腐蚀时都呈现出两层腐蚀膜，腐蚀膜主要由 FeCO3、α-FeOOH 和内层的点状 Fe3C 组成。由此推断，在腐蚀膜中观察到的碳拾取现象归因于 FeCO3 的形成，也可能是由于 Fe3C 与碳酸发生反应所致。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Corrosion Engineering, Science and Technology: The International Journal of Corrosion Processes and Corrosion Control

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