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Phosphonium ionic liquids as lubricants for aluminium-steel

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conference contribution
posted on 01.01.2010, 00:00 authored by Anthony SomersAnthony Somers, Patrick HowlettPatrick Howlett, J Sun, D MacFarlane, Maria ForsythMaria Forsyth
The performance of a series of novel room temperature ionic liquids (ILs) based on the trihexyl(tetradecyl)phosphoniumcation (P66614 +) and a number of novel anions have been studied in pin-on-disk tests using a 100Cr6 steel ball on AA2024 aluminium disks.

The anions coupled to the (P66614 +) cation include diphenyl phosphate (DPP-), dibutyl phosphate (DBP-), bis (2,4,4-trimethyl pentyl) phosphinate (M3PPh-) and bis(2-ethyl hexyl) phosphate (BEH-).

More traditional anions such as bis(trifluoromethanesulfonyl) amide (NTf2 -) and bromide (Br-) were also investigated. Experiments were conducted at various loads to assess the IL film forming abilities.

The results suggest that the structure of the anion is important in forming a surface film that reduces the friction and wear of the aluminium disk. At 30N five of the six ILs tested showed a 30-90% reduction in wear, as determined from wear scar depth measurements, compared to fully formulated diesel oil.

The IL lubricant with a diphenyl phosphate anion achieved the lowest wear coefficient, showing a better performance than a typical fluorine-containing IL anion, NTf2.

To further investigate wear mechanisms and surface interactions the wear scars were analysed using a scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS).

History

Event

International Conference on Tribology in Environmental Design (3rd : 2010 : Algarve, Portugal)

Series

WIT transactions on engineering sciences, 1746-448X ; v. 66.

Pagination

273 - 284

Publisher

WIT

Location

Algarve, Portugal

Place of publication

Southampton, England

Start date

11/05/2010

End date

13/05/2010

ISSN

1746-448X

ISBN-13

9781845644406

ISBN-10

1845644409

Language

eng

Publication classification

E1.1 Full written paper - refereed

Copyright notice

2010, WIT

Editor/Contributor(s)

M Hadfield, J Seabra, C Brebbia

Title of proceedings

Tribology & design : Proceedings of the 3rd International Conference on Tribology in Environmental Design 2010