ISSN   1004-0595

CN  62-1224/O4

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质子型离子液体水基润滑液摩擦学性能研究

Lubricating Properties of the Protic Ionic Liquids as the Water-Based Lubricating Additives

  • 摘要: 配置了不同质量分数的质子型离子液体二乙醇胺月桂酸(Bis(2-hydroxyethyl)ammonium lauric,BOEAL)水溶液,使用MRS-10A摩擦试验仪、NGY-6型纳米膜厚测量仪、接触角测量仪,对BOEAL水溶液的减摩抗磨性能、极压性能、成膜性能和润湿性等进行试验研究,并用3D共聚焦表面形貌仪和XPS对摩擦磨损机制进行了分析. 结果表明: 质量分数为5%的BOEAL水溶液最大无卡咬负荷在834~883 N之间,相比纯水(98 N)有较大的提高,即BOEAL可作为水基润滑液的极压添加剂. BOEAL的加入显著提高了纯水的成膜能力以及在钢-钢摩擦副表面的润湿性能. 分析原因是BOEAL中的极性基团可以在金属表面形成致密的化学吸附膜或物理吸附膜,从而使得金属摩擦副的摩擦系数降低,抗磨效果提高,同时由于BOEAL分子极性较强,低质量分数的BOEAL水溶液在不锈钢表面就表现出良好的摩擦学性能.

     

    Abstract: Protic ionic liquid (Bis(2-hydroxyethyl)ammonium lauric, BOEAL) aqueous solutions were prepared. Friction-reducing and anti-wear properties, extreme pressure properties, film forming properties and wettability of BOEAL aqueous solutions were tested on the MRS-10A friction tester, NGY-6 nanometer and Contact angle tester. The friction and wear mechanism were analyzed by 3D surface profiler and X-ray photoelectron spectrometer. The results show that low concentration BOEAL aqueous solution had excellent extreme pressure performance, and the non-seizure value(PB)of the BOEAL aqueous solution(5%) was between 834 N and 883 N. Compared to that of pure water (98 N), the BOEAL aqueous solution had good extreme pressure performance. The film forming ability of pure water and the wettability of steel-steel friction pair surface were remarkably improved by BOEAL. The reason was that the polar groups of BOEAL can form a dense chemical or physical adsorption film on the metal surface, which reduced the friction coefficient and improved the anti-wear properties. Because of the saturated adsorption of the polar molecules, low concentration of BOEAL aqueous solutions had good tribological properties.

     

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