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

doi:10.13251/j.issn.0254-6051.2020.06.047

Abstract

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

CLC Number:

TG172

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

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