Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 22, Pages 11544-11553Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am4037614
Keywords
ionic liquid lubricants; antiwear additives; base oil miscibility; tribology; aluminum lubrication; phosphonium; tribofilm
Funding
- Australian Research Council (ARC) [LP120100239]
- ARC via the Australian Laureate Fellowship scheme
- Australian Research Council [LP120100239] Funding Source: Australian Research Council
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The use of ionic liquids as additives to base oil for the lubrication of steel on aluminum was investigated. The miscibility and wear performance of various phosphonium, imidazolium, and pyrrolidinium ionic liquids in a range of polar and nonpolar base oils was determined. The structure and ion pairing of the ionic liquids was found to be important in determining their miscibility in the base oils. In wear tests, some of the miscible base oil/IL blends reduced the aluminum wear depth when compared to that found with the base oil alone. The nonpolar base oil/IL blends were able to withstand higher wear-test loads than the polar base oil/IL blends. At 10 N, as little as 0.01 mol/kg of IL, or 0.7-0.9 wt %, in the nonpolar base oils was enough to drastically reduce the wear depth on the aluminum. XPS analysis of the wear surfaces suggested that the adsorbing of the IL to the surface, where it can form low-shear layers and also react to form tribofilms, is important in reducing friction and wear. The largest reductions in wear at the highest load tested were found for a mineral oil/P-6,P-6,P-6,P-14 (1)(C-8)(2)PO2 blend.
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