Synthesis and physical property characterisation of phosphonium ionic liquids based on P(O)2(OR)2− and P(O)2(R)2− anions with potential application for corrosion mitigation of magnesium alloys

Sun, Jiazeng; Howlett, Patrick C.; MacFarlane, Douglas R.; Lin, Ji Xing; Forsyth, Maria

doi:10.1016/j.electacta.2008.08.020

Cited by 93 publications

(63 citation statements)

References 23 publications

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“…The preparation of the ILs with the DPP, DBP, M 3 PPh and BEH anions is detailed elsewhere [20][21][22], while Cytec Canada Inc. supplied the ILs with NTf 2 and Bromide anions. The diesel oil used as a standard lubricant was a fully formulated 15W-50 multigrade oil meeting the API CH-4/SL standard.…”

Section: Methodsmentioning

confidence: 99%

Phosphonium ionic liquids as lubricants for aluminium-steel

Somers¹,

Howlett²,

Sun³

et al. 2010

Tribology and Design

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The performance of a series of novel room temperature ionic liquids (ILs) based on the trihexyl(tetradecyl)phosphoniumcation (P 66614 + ) 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 (P 66614 + ) cation include diphenyl phosphate (DPP-), dibutyl phosphate (DBP-), bis (2,4,4-trimethyl pentyl) phosphinate (M 3 PPh -) and bis(2-ethyl hexyl) phosphate (BEH-). More traditional anions such as bis(trifluoromethanesulfonyl) amide (NTf 2 -) 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, NTf 2 . To further investigate wear mechanisms and surface interactions the wear scars were analysed using a scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS).

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Section: Methodsmentioning

confidence: 99%

Phosphonium ionic liquids as lubricants for aluminium-steel

Somers¹,

Howlett²,

Sun³

et al. 2010

Tribology and Design

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“…Fourier transform infrared spectroscopy (FTIR) was carried out using a Nicolet (Warwick, UK) Magna 560 spectrometer and all liquid samples for analysis were prepared as a thin liquid film between sodium chloride plates, and solid samples as a potassium bromide disc. Nuclear magnetic resonance spectroscopy (NMR) was conducted at Queen Mary University of London using an AV 600 MHz FT NMR spectrometer (Coventry, UK) with Me 4 Si as a reference. Mass spectrometry was conducted by EPSRC National Mass Spectrometry Service Centre at the University of Wales, using an electron spray ionisation (ESI) technique on a Waters ZQ4000 spectrometer (Waters, Hertfordshire, UK).…”

Section: Wwwsociorg H Lateef Et Almentioning

confidence: 99%

Separation and recovery of cellulose and lignin using ionic liquids: a process for recovery from paper‐based waste

Lateef

Grimes

Kewcharoenwong

et al. 2009

J of Chemical Tech & Biotech

105

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“…The tested ILs, comprising of these cations and anions, are shown in Table 1. The synthesis and characterization of (P6,6,6,14)(BEHP) is detailed in Sun et al [19], while synthesis of (P6,6,6,14)(SSi) is detailed in Somers et al [9]. The quaternary ammonium salts were prepared in our laboratory using the following procedure: Tetraoctylammonium bromide (98%), Tetradecyltrihexylammonium bromide (≥97.0%) and bis(2-ethylhexyl)phosphoric acid (97%) were purchased from Sigma Aldrich (Castle Hill, Australia) and used without further purification.…”

Section: Additivesmentioning

confidence: 99%

Towards Phosphorus Free Ionic Liquid Anti-Wear Lubricant Additives

et al. 2016

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Abstract:The development of improved anti-wear additives would enable the use of lower viscosity oils that would lead to improved efficiency. Ionic liquids have the potential to be this type of new anti-wear additive. However, currently the best performing ionic liquids that are miscible in non-polar base oils, the phosphonium phosphates, contain phosphorus on both the cation and anion. Manufacturers are seeking to reduce the presence of phosphorus in oils. Here, as a first step towards phosphorus-free anti-wear additives, we have investigated ionic liquids similar to the phosphonium phosphates but having either a phosphorus-free cation or anion. Two quaternary ammonium phosphates (N 6,6,6,14 )(BEHP) and (N 8,8,8,8 )(BEHP) and a phosphonium silyl-sulfonate (P 6,6,6,14 )(SSi) were compared to a phosphonium phosphate (P 6,6,6,14 )(BEHP) and a traditional zinc dithiophosphate (ZDDP) as anti-wear additives in mineral oil. The change from a phosphonium to a quaternary ammonium cation drastically reduced the miscibility of the Ionic liquid (IL) in the oil, while the change to a smaller silicon containing anion also resulted in limited miscibility. For the pin-on-disk wear test conditions used here none of the ionic liquids outperformed the ZDDP except the (P 6,6,6,14 )(BEHP) at a relatively high loading of 0.10 mol¨kg´1 (approximately 8 wt%). At a more moderate loading of 0.025 mol¨kg´1 the (P 6,6,6,14 )(SSi) was the best performing ionic liquid by a significant amount, reducing the wear to 44% of the neat mineral oil, while the ZDDP reduced the wear to 25% of the mineral oil value. Electron microscopy and energy dispersive X-ray spectroscopy showed that the presence of a silicon containing tribofilm was responsible for this protective behaviour, suggesting that silicon containing ionic liquids should be further investigated as anti-wear additives for oils.

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Synthesis and physical property characterisation of phosphonium ionic liquids based on P(O)2(OR)2− and P(O)2(R)2− anions with potential application for corrosion mitigation of magnesium alloys

Cited by 93 publications

References 23 publications

Phosphonium ionic liquids as lubricants for aluminium-steel

Phosphonium ionic liquids as lubricants for aluminium-steel

Separation and recovery of cellulose and lignin using ionic liquids: a process for recovery from paper‐based waste

Towards Phosphorus Free Ionic Liquid Anti-Wear Lubricant Additives

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