月桂酸无规共聚醚水溶液减摩抗磨性能试验研究

Study on Friction-reducing and Anti-wear Performances of Lauric Acid Random Copolyether Aqueous Solutions

配制不同质量分数的月桂酸无规共聚醚(Lauric acid random copolyether,LPE)水溶液,使用摩擦磨损试验仪进行钢/铝和钢/钢摩擦副下的减摩抗磨性能试验。分别研究质量分数、载荷和试样表面粗糙度对LPE水溶液减摩抗磨性能的影响,并用三维共聚焦表面形貌仪和能量色散光谱仪分析试样磨痕的表面形貌变化。结果表明,在质量分数为0.5%的LPE水溶液润滑下,其减摩幅度相比纯水润滑已超过65%,LPE水溶液的减摩性能随着质量分数和载荷的增加而提高,随着试样表面粗糙度的改善也得到相应提高。试样磨痕浅而工整,抗磨性能良好。分析原因是LPE水溶液中的极性基团吸附在金属表面而形成了致密的化学吸附膜或物理吸附膜,从而隔离金属摩擦表面而起到了有效的减摩抗磨效果,其中的极性分子具有饱和吸附量,低浓度下就表现出了较好的减摩抗磨性能,获得良好的工业应用。

Lauric acid random copolyether（LPE） aqueou solutions with different mass fraction are prepared.Friction-reducing and anti-wear performances of LPE aqueous solutions are tested on the friction and wear tester.Tribo pairs of steel/aluminum and steel/steel are selected and the influences of mass fraction,load,and specimen surface roughness are discussed.The surface morphology of samples are measured by the phase shift MicroXAM-3D and the energy dispersive spectrometer.The results show that friction-reducing capability of 0.5% LPE aqueous solutions decrease up to 65% or more,being compared to water.As the mass fraction,load and specimen surface roughness increasing,friction-reducing performances get better.The specimen wear scars are shallow and uniform.The phenomenon indicates that polarity adsorption groups in LPE aqueous solutions forming thick chemical adsorbed film and physical adsorbed film on the metal surfaces.The films have better friction-reducing and anti-wear performances by seperating friction surfaces.The polar molecule has saturated adsorption capacity,so it shows good friction-reducing and anti-wear properties at low mass fraction.It lays a foundation for the rosy prospect in industrial application.