Oil-miscible and non-corrosive phosphonium-based ionic liquids as candidate lubricant additives

Oil-miscible and non-corrosive phosphonium-based ionic liquids as candidate lubricant additives Ionic liquids (ILs) have been receiving considerable attention from the lubricants industry as potential friction and wear-reducing additives, but their solubility in oils is an issue. Unlike most ionic liquids that are insoluble in non-polar hydrocarbon oils, this study reports phosphonium-based ILs (PP-ILs) that are fully miscible with both mineral oil-based and synthetic lubricants. Both the cation and anion in quaternary structures, long alkyl chains, and capability of pairing the cation and the anion via a H–O bond are hypothesized to improve the compatibility between ions and neutral oil molecules. The measured viscosities of the oil-IL blends agree well with the Refutas equation that is for solutions containing multiple components. High thermal stability and non-corrosiveness were observed for the PP-ILs. Effective friction reduction and anti-wear functionality have been demonstrated in tribological tests when adding 5 wt% of a PP-IL into a base oil, suggesting potential applications for using the oil-miscible PP-ILs as lubricant additives. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Wear Elsevier

Oil-miscible and non-corrosive phosphonium-based ionic liquids as candidate lubricant additives

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Abstract

Ionic liquids (ILs) have been receiving considerable attention from the lubricants industry as potential friction and wear-reducing additives, but their solubility in oils is an issue. Unlike most ionic liquids that are insoluble in non-polar hydrocarbon oils, this study reports phosphonium-based ILs (PP-ILs) that are fully miscible with both mineral oil-based and synthetic lubricants. Both the cation and anion in quaternary structures, long alkyl chains, and capability of pairing the cation and the anion via a H–O bond are hypothesized to improve the compatibility between ions and neutral oil molecules. The measured viscosities of the oil-IL blends agree well with the Refutas equation that is for solutions containing multiple components. High thermal stability and non-corrosiveness were observed for the PP-ILs. Effective friction reduction and anti-wear functionality have been demonstrated in tribological tests when adding 5 wt% of a PP-IL into a base oil, suggesting potential applications for using the oil-miscible PP-ILs as lubricant additives.

Journal

WearElsevier

Published: Jun 15, 2012

References

  • Functional room-temperature ionic liquids as lubricants for an aluminum-on-steel system
    Mu, Z.G.; Liu, W.M.; Zhang, S.X.; Zhou, F.
  • The tribological performance of BCN films under ionic liquids lubrication
    Chen, Y.M.; Zeng, Z.X.; Yang, S.R.; Zhang, J.Y.
  • Tribological characteristics of aluminum alloys sliding against steel lubricated by ammonium and imidazolium ionic liquids
    Qu, J.; Blau, P.J.; Dai, S.; Luo, H.M.; Meyer, H.M.; Truhan, J.J.
  • Influence of temperature on PA 6-steel contacts in the presence of an ionic liquid lubricant
    Sanes, J.; Carrion, F.J.; Jimenez, A.E.; Bermudez, M.D.
  • Micro/macrotribological properties of several nano-scale ionic liquid films on modified silicon wafers
    Zhu, M.; Mo, Y.F.; Zhao, W.J.; Bai, M.W.
  • Capacity of selected ionic liquids as alternative EP/AW additive
    Schneider, A.; Brenner, J.; Tomastik, C.; Franek, F.

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