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Erschienen in: Tribology Letters 2/2016

01.08.2016 | Original Paper

Tertiary and Quaternary Ammonium-Phosphate Ionic Liquids as Lubricant Additives

verfasst von: William C. Barnhill, Huimin Luo, Harry M. Meyer III, Cheng Ma, Miaofang Chi, Brian L. Papke, Jun Qu

Erschienen in: Tribology Letters | Ausgabe 2/2016

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Abstract

In this work, we investigated the feasibility of five quaternary (aprotic) and four tertiary (protic) ammonium ionic liquids (ILs) with an identical organophosphate anion as lubricant anti-wear additives. Viscosity, oil solubility, thermal stability and corrosivity of the candidate ILs were characterized and correlated to the molecular structure. The protic group exhibits higher oil solubility than the aprotic group, and longer alkyl chains seem to provide better oil solubility and higher thermal stability. Selected ILs were applied as oil additives in steel–cast iron tribological tests and demonstrated promising anti-scuffing and anti-wear functionality. The thickness, nanostructure, and composition of the tribofilm formed by the best performing IL were revealed by surface characterization for mechanistic understanding of the tribochemical interactions between the IL and metal surface. Results provide fundamental insights of the correlations among the molecular structure, physiochemical properties and lubricating performance for ammonium-phosphate ILs.

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Metadaten
Titel
Tertiary and Quaternary Ammonium-Phosphate Ionic Liquids as Lubricant Additives
verfasst von
William C. Barnhill
Huimin Luo
Harry M. Meyer III
Cheng Ma
Miaofang Chi
Brian L. Papke
Jun Qu
Publikationsdatum
01.08.2016
Verlag
Springer US
Erschienen in
Tribology Letters / Ausgabe 2/2016
Print ISSN: 1023-8883
Elektronische ISSN: 1573-2711
DOI
https://doi.org/10.1007/s11249-016-0707-6

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