Recently, the excellent performance of ionic liquid and MEA mixed solution as CO₂ absorbent has been researched by many scholars, while the corrosion mechanism of the mixed solutions is less discussed. In this work, the corrosion behavior of AISI 1020 steel in MEA and [Bmim]BF₄ mixed solutions Containing saturated CO₂ was studied by weight loss experiment. Morphology of scales and metal surface was studied by SEM and EDS. The surface state of the electrode was analyzed by electrochemical impedance spectroscopy (EIS) fitting equivalent circuit, and Passivation law of the passivation zone was analyzed by potentiodynamic scanning test. The results show that in the mixed solution saturated with CO₂, MEA will degrade and increase the uniform corrosion rate of AISI 1020 steel. When [Bmim]BF₄ is added to MEA solution, the uniform corrosion rate is inhibited; however, due to the dissociation of F⁻ in BF₄-, as the concentration of [Bmim]BF₄ increases, the range of passivation region becomes narrower, and the stability of the passivation film becomes worse, which induces pitting corrosion of AISI 1020 steel.

近年来，许多学者研究了离子液体和MEA混合溶液作为CO ₂吸收剂的优异性能，而对混合溶液的腐蚀机理的讨论较少。通过失重实验研究了AISI 1020钢在MEA和含饱和CO _2的[Bmim] BF ₄混合溶液中的腐蚀行为。用SEM和EDS研究了氧化皮和金属表面的形貌。通过电化学阻抗谱（EIS）拟合等效电路分析电极的表面状态，并通过电势扫描测试分析钝化区的钝化定律。结果表明，在混合溶液中饱和了CO ₂，MEA会降低AISI 1020钢的均匀腐蚀速率并提高其均匀腐蚀速率。在MEA溶液中添加[Bmim] BF _4时，会抑制均匀的腐蚀速率。然而，由于F的离解^-在BF ₄ - ，随着[BMIM] BF浓度_4度增加时，钝化区域的范围变窄，和钝化膜的稳定性变差，这引起孔蚀AISI 1020的腐蚀钢。