【摘 要】
：
Effect of temperature on corrosion behavior of VM110SS casing steel in H2S/CO2 co-existing environment was investigated by high temperature and high pressure (HTHP) autoclave and the electrochemical c
【机 构】
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State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest PetroleumUniversity,
【出 处】
：
第十一届全国表面工程大会暨第八届全国青年表面工程学术会议
论文部分内容阅读
Effect of temperature on corrosion behavior of VM110SS casing steel in H2S/CO2 co-existing environment was investigated by high temperature and high pressure (HTHP) autoclave and the electrochemical corrosion method. In addition, scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) was used to characterize the morphologies and structure of corrosion scales. The results show that the corrosion rates of VM110SS steel in gas-liquid two phase acidic environment increase exponentially with the temperature rise, and it is in the range of extremely severe corrosion; the principal components of product may be FexSy, indicating that the corrosion process is mainly controlled by H2S. The corrosion scales with porous flocculent structure can be detected in the gas phase; however, the corrosion scale with brittle characteristic can be easily exfoliated in the liquid phase. With the temperature increasing, the corrosion scales become more loose and porous, illustrating its poor corrosion resistance. Electrochemical tests show that the corrosion current density of VM110SS steel increases with the increase of temperature and the total impedance decreases. The cathode process is greatly affected by temperature, and the corrosion reaction is mainly controlled by diffusion and activation. The protective performance of the corrosion product film gradually decreases, and the corrosion rate reaches the maximum at 90℃. The corrosion environments and corrosion reaction process change with the temperature variation, thus affecting the properties of corrosion products, which provides a theoretical basis for corrosion failure analysis of casing and technical guidance for material selection.
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