多库酯类离子液体作为镁合金润滑剂的摩擦学性能及机理研究  

Tribological Properties and Mechanism of Dioctyl Sulfosuccinate Ionic Liquids as Lubricants for Magnesium Alloys

作　　者：韩云燕 范晓丽 凡明锦 文平 HAN Yunyan;FAN Xiaoli;FAN Mingjin;WEN Ping(Shaanxi Key Laboratory of Phytochemistry,College of Chemistry&Chemical Engineering,Baoji University of Arts and Sciences,Shaanxi Baoji 721013,China)

机构地区：[1]宝鸡文理学院化学化工学院陕西省植物化学重点实验室,陕西宝鸡721013

出　　处：《摩擦学学报》2022年第2期254-264,共11页Tribology

基　　金：国家自然科学基金项目(51675006,51705004);陕西省自然科学基础研究计划一般项目(2019JQ-894);陕西省教育厅重点实验室项目(20JS004);固体润滑国家重点实验室开放课题项目(LSL-1812)资助。

摘　　要：合成了以季铵盐、季鏻盐和烷基咪唑为阳离子,琥珀酸二异辛酯磺酸为阴离子的五种多库酯类离子液体,考察了其理化性能,研究其作为钢-镁合金摩擦副润滑剂的摩擦学性能,并与常规离子液体1-丁基-3-甲基咪唑双(三氟甲基磺酰基)亚胺(L-F104)作对比.结果表明:该类离子液体具有良好的黏温性能和热稳定性,并且与L-F104相比,对镁合金腐蚀较轻,且具有优异的减摩抗磨性能;接触电阻和磨斑表面元素分析结果表明该类离子液体能够在镁合金表面形成有效的吸附膜,且摩擦试验过程中形成了MgSO_(4)和MgO等物质的摩擦化学反应膜,能够阻止摩擦过程中金属表面间的直接接触,从而起到减摩抗磨效果.In this study,five kinds of ionic liquids were synthesized with quaternary ammonium,quaternary phosphonium or alkyl imidazolium as cations and dioctyl sulfosuccinate as anions.The physicochemical properties of these ionic liquids were investigated.The tribological performances of these ionic liquids as lubricants for steel/magnesium alloy friction pairs were evaluated by SRV-V oscillating friction and wear tester,where the conventional ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide(L-F104)was used as a reference sample.And the lubrication mechanisms of these ionic liquids were also investigated by the characterization of the contact resistance during friction tests,surface morphologies and element state on the worn surfaces.The results show that the viscosities of the five dioctyl sulfosuccinate ionic liquids at 40 and 100℃are higher than that of the reference sample L-F104,especially at 40℃.With the increase of cationic alkyl chain length,the viscosity of dioctyl sulfosuccinate ionic liquids basically decrease,which may be due to the large volume of cations,weakening the interaction between the anions and cations in the ionic liquids.The viscosity indexes of the synthesized ionic liquids are higher than that of the LF104.The viscosity index increased with the increasing of the alkyl chain in cation.It can be concluded that the synthesized dioctyl sulfosuccinate ionic liquids have better film formation properties and viscosity-temperature performance than the reference sample L-F104.From the thermogravimetric results,both the synthesized ionic liquids and the L-F104 exhibit well thermal stability,which start to decompose above 200℃.However,the thermal stability of the dioctyl sulfosuccinate ionic liquids is lower than that of the L-F104.Among these dioctyl sulfosuccinate ionic liquids,the ionic liquids with quaternary phosphonium as cation exhibit much better thermal stability than the others.It can be seen from the corrosion tests that both the synthesized ionic liquids and the

关 键 词：多库酯类离子液体 镁合金 润滑剂 摩擦学性能 摩擦膜 

分 类 号：TH117.3[机械工程—机械设计及理论]