Tribological characteristics of aluminum alloys sliding against steel lubricated by ammonium and imidazolium ionic liquids
Tribological characteristics of aluminum alloys sliding against steel lubricated by ammonium and imidazolium ionic liquids
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DOI：
10.1016/j.wear.2008.12.038
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发表时间：
2009-06
期刊：
影响因子：
5
通讯作者：
J. Qu;P. Blau;S. Dai;H. Luo;H. Meyer;J. J. Truhan-J.
中科院分区：
文献类型：
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作者：
J. Qu;P. Blau;S. Dai;H. Luo;H. Meyer;J. J. Truhan-J.
研究了离子液体(ILS)润滑下铝合金与AISI 52100钢在室温和高温下的滑动摩擦磨损特性。所测试的铝合金包括工业纯铝Al 1100-O、变形合金Al 6061-T6511和铸造合金Al 319-T6。比较了含有相同阴离子的两种离子液体油[C8H17]3NH.Tf2N和咪唑基C10Mim.Tf2N的润滑性能，并与常规全配方内燃机油进行了对比。与发动机油相比，在润滑这三种铝合金时，铵IL显著减少了摩擦(高达35%)和磨损(高达55%)。在Al-1100和319合金中，咪唑IL的效果优于油，但不如铵离子。然而，在C10Mim.Tf2N润滑下，Al 6061合金意外地出现了加速磨损现象。表面化学分析表明，在磨损试验过程中，铝表面与ILS之间发生了复杂的摩擦化学反应，这些反应要么有利于形成保护性的边界膜，要么导致严重的摩擦腐蚀。讨论了离子液体结构、铝合金成分和摩擦试验条件对摩擦磨损结果的影响。
Sliding friction and wear characteristics of aluminum alloys against AISI 52100 steel lubricated by ionic liquids (ILs) were investigated at both room and elevated temperatures. The tested aluminum alloys include a commercially pure aluminum Al 1100–O, a wrought alloy Al 6061–T6511, and a cast alloy Al 319–T6. The lubricating performance of two ILs with the same anion, one ammonium-based [C8H17]3NH.Tf2N and one imidazolium-based C10mim.Tf2N, were compared to each other and benchmarked against that of a conventional fully-formulated engine oil. Significant friction (up to 35%) and wear (up to 55%) reductions were achieved by the ammonium IL when lubricating the three aluminum alloys compared to the engine oil. The imidazolium IL performed better than the oil but not as well as the ammonium IL for Al 1100 and 319 alloys. However, accelerated wear was unexpectedly observed for the Al 6061 alloy when lubricated by C10mim.Tf2N. Surface chemical analyses implied complex tribochemical reactions between the aluminum surfaces and ILs during the wear testing, which have been demonstrated either beneficial by forming a protective boundary film or detrimental by causing severe tribo-corrosion. The effects of the IL cation structure, aluminum alloy composition, and tribo-testing condition on the friction and wear results have been discussed.