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Technical Briefs

Investigation of Tribological Behavior of Al–Si Alloy Against Steel Lubricated With Ionic Liquids of 1-Diethylphosphonyl-n-propyl-3- Alkylimidazolium Tetrafluoroborate

[+] Author and Article Information
Zonggang Mu

School of Chemistry and Chemical Engineering, University of Jinnan, Jinan, 250022, P.R.C.; State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, P.R.C.chm̱mouzg@ujn.edu.cn

Xiaoxuan Wang, Shuxiang Zhang, Meng Bao

School of Chemistry and Chemical Engineering, University of Jinnan, Jinan, 250022, P.R.C.

Yongmin Liang

State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, P.R.C.

Weimin Liu1

State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, P.R.C.

1

Corresponding author.

J. Tribol 130(3), 034501 (Jun 23, 2008) (5 pages) doi:10.1115/1.2913553 History: Received March 19, 2007; Revised March 24, 2008; Published June 23, 2008

A series of room temperature ionic liquids bearing with phosphonyl groups on the imidazolium cations, namely, 1-(3-O,O-diethylphosphonyl-n-propyl)-3-alkylimidazolium tetrafluoroborate, were prepared and their physical properties were determined. They were also evaluated as promising lubricants for the contacts of aluminum on steel by using a SRV test rig. The tribological test results show that the synthetic ionic liquids exhibit better friction-reducing and antiwear abilities than the unsubstituted ionic liquid of 1-ethyl-3-hexylimidazolium tetrafluoroborate (coded as L206) and phosphazene (X-1P). Both the anions and the side substitutes attached to the imidazolium cations affect the tribological performance of lubricants. The scanning electron microscopy, energy-dispersive x-ray analysis, and x-ray photoelectron spectroscopy analyses of the worn surfaces show that complicated tribochemical reactions are involved in the sliding process. The anion decomposition and chemical adsorption of cation took place on the worn surface of aluminum alloy during the sliding process. As a result of the generation of boundary lubrication films which are composed of metal fluorides, B2O3, BN, nitrogen oxide, and FePO4 help to effectively reduce the friction and wear of the contacts.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic illustration of Optimol SRV tester

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Figure 2

The preparation of the ionic liquids

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Figure 3

Variation of friction coefficient as the function of load when lubricating with ionic liquids and X-1P for the Al2024/steel contacts at 25°C

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Figure 4

Wear volume loss as a function of load when lubricating with ionic liquids and X-1P in the Al2024/steel system at 25°C

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Figure 5

SEM morphologies of the worn surfaces of Al alloy lubricated by X-1P (a), L206 (b), and [DPPHIM][BF4] (c), and the EDXA maps of the elemental distributions of F (d), Fe (e), and P (f) on the worn surface of Al alloy disk lubricated by [DPPHIM][BF4]

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Figure 6

XPS spectra of neat [DPPOIM][BF4] (A) and of wear scars on Al alloy disks lubricated by [DPPOIM][BF4] (B) at 60N and 25°C

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Figure 7

Schematic of chemical adsorption and interaction of the ionic liquids with Al surface during the sliding process

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