摘要
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 ionic liquids,hydrogen sulfate and tetrafluoroborate of 1-octyl-2-pyrrolidonium （[Hnop]HSO_4/BF_4）,were prepared.Their inhibition and adsorption behavior on mild steel in 1 mol/L hydrochloric acid solutions were investigated by mass loss and electrochemical methods,respectively.The results indicate the ionic liquids act as the mixed type inhibitors.The inhibition efficiency of ionic liquids increases with the increasing inhibitor concentration,decreases with increased temperature and reaches more than 90% for[Hnop]HSO_4 in 0.8 mmol/L at 303 K.The adsorption of[Hnop]HSO_4 on the surface of mild steel obeys the Langmuir adsorption isotherm via physicochemical adsorption,which is a spontaneous exothermic process.
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2011年第5期336-340,共5页
Journal of Chinese Society For Corrosion and Protection
基金
广东省自然科学基金项目(8151009001000024)资助
关键词
离子液体
低碳钢
盐酸
吸附
电化学技术
ionic liquid
mild steel
hydrochloric acid
adsorption
electrochemistry techniques
