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合成了两种吡咯烷酮酸性离子液体1-辛基-2-吡咯烷酮的硫酸氢盐/四氟硼酸盐([Hnop]HSO_4/BF_4)。以失重法和电化学方法考察它们在1 mol/L HCl溶液中对低碳钢(Q235)的缓蚀性能,探讨其缓蚀机理和吸附行为。结果表明,两种离子液体均有缓蚀作用,属于混合型缓蚀剂。缓蚀率随浓度增加递增,随温度升高而下降。[Hnop]HSO_4的缓蚀性能优于[Hnop]BF_4。30℃下,[Hno p]HSO_4在1 mol/L HCl溶液中的添加浓度为0.8 mmol/L时,缓蚀率可达90%以上。其在碳钢表面上的吸附符合Langmuir吸附等温关系,是自发放热过程,同时兼有物理吸附和化学吸附两种吸附机制。
Two kinds of bisulfate / tetrafluoroborate ([Hnop] HSO_4 / BF_4) were synthesized using 1-octyl-2-pyrrolidone as the ionic liquid of pyrrolidone. The corrosion inhibition behavior and the adsorption behavior of Q235 in 1 mol / L HCl solution were investigated by weight loss method and electrochemical method. The results show that both ionic liquids have a corrosion inhibition, which is a mixed type corrosion inhibitor. Corrosion inhibition rate increases with increasing concentration, decreasing with increasing temperature. The corrosion inhibition performance of [Hnop] HSO_4 is better than that of [Hnop] BF_4. When [Hno p] HSO_4 is added to 1 mol / L HCl solution at 0.8 mmol / L, the corrosion inhibition rate can reach more than 90% . Its adsorption on the surface of carbon steel accords with the Langmuir adsorption isotherm, which is a spontaneous exothermic process, and has both adsorption mechanisms of physical adsorption and chemisorption.