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首页> 外文期刊>Tribology International >Effect of the functional groups in ionic liquid molecules on the friction and wear behavior of aluminum alloy in lubricated aluminum-on-steel contact
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Effect of the functional groups in ionic liquid molecules on the friction and wear behavior of aluminum alloy in lubricated aluminum-on-steel contact

机译：离子液体分子中官能团对铝-钢润滑接触中铝合金摩擦磨损性能的影响

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摘要

Four imidazolium-based room temperature ionic liquids containing phosphonyl functional groups, i.e. l-(3'-O,O-diethylphosphonyl-n-propyl)-3-alkylimidazolium tetrafluoroborates and hexafluorophosphates, were synthesized. The physical properties of the resulting synthetic products were evaluated, and their tribological behaviors as the lubricants for an aluminum-on-steel sliding system were evaluated on an oscillating friction and wear tester, with the emphasis being placed on the effect of the O,O-diethylphosphonyl groups in the ionic liquid molecules on the tribological behaviors. Thus the friction and tests were conducted at a frequency of 25 Hz, a sliding amplitude of 1 mm, and for a duration of 30 min. The worn aluminum surface was analyzed by means of scanning electron microscopy, energy dispersive X-ray analysis, and X-ray photoelectron spectroscopy. It was found that the synthesized ionic liquids had better friction-reducing and anti-wear ability for the aluminum-on-steel system than their nonfunctionalized courterparts (1-ethyl-3-hexylimidazolium tetrafluoroborate, coded as L206, and 1-propyl-3-octylimidazolium hexafluorophosphate, coded as LP308). Especially, they had much better load-carrying capacity than L206 and LP308. The tribological behaviors of the synthetic lubricants were dependent on both the anions and the side-substituted alkyl chains attached to the imidazolium cations. Moreover, physical adsorption and complicated tribochemical reactions were involved during the sliding process of the Al-on-steel system under the lubrication of the synthetic functionalized ionic liquids, which led to the generation of physically adsorbing and chemically reacting films composed of five-member-ring complex compounds, metal fluorides, nitrogen oxide, and FePO{sub}4 on the rubbed Al surface. Those physically adsorbing and chemically reacting films contributed to effectively decrease the friction and wear of the aluminum sliding against steel.
机译：合成了四种含膦酰基官能团即1-（3'-O，O-二乙基膦酰基-正丙基）-3-烷基咪唑四氟硼酸酯和六氟磷酸盐的基于咪唑鎓的室温离子液体。对所得合成产品的物理性能进行了评估，并在振荡摩擦和磨损测试仪上评估了其作为钢铝滑动系统润滑剂的摩擦学性能，重点是O，O的影响。 -二乙基膦酰基在离子液体分子上的摩擦学行为。因此，摩擦和测试在25 Hz的频率，1 mm的滑动幅度下进行，持续30分钟。通过扫描电子显微镜，能量色散X射线分析和X射线光电子能谱分析磨损的铝表面。研究发现，合成的离子液体对钢上铝体系具有更好的减少摩擦和抗磨损的能力，而与非官能化的离子液体（1-乙基-3-六咪唑四氟硼酸酯，编号为L206，和1-丙基-3 -辛基咪唑六氟磷酸盐，编码为LP308）。特别是，它们具有比L206和LP308更好的承载能力。合成润滑剂的摩擦学性能取决于阴离子和与咪唑鎓阳离子连接的侧取代烷基链。此外，在合成功能化离子液体的润滑下，钢上铝体系的滑动过程涉及物理吸附和复杂的摩擦化学反应，从而导致了由五元碳原子组成的物理吸附和化学反应膜的生成。环铝化合物上的环配合物，金属氟化物，氮氧化物和FePO {sub} 4。这些物理吸附和化学反应的薄膜有助于有效减少铝与钢滑动的摩擦和磨损。

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