Tribological behaviour of two imidazolium ionic liquids as lubricant additives for steel/steel contacts

Battez, A. Hernández; González, R.; Viesca, J.L.; Blanco, David; Asedegbega, E.; Osório, Alice Gonçalves

doi:10.1016/j.wear.2009.03.043

Cited by 139 publications

(76 citation statements)

References 20 publications

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“…X-Ray photoelectron spectroscopy (XPS) has been the most widely used, due to its ability to identify not only the elements present on the wear scar surface, but also the chemical state of the atom [6,[15][16][17][18][19][20][21][22][23]25,[28][29][30]32,33,35,38,40,44,47,48,[51][52][53][54]. Scanning electron microscopy (SEM) has been used to identify the type of wear occurring based on the wear scars appearance with the associated energy dispersive X-ray spectroscopy (EDX) used to ascertain the elements present on the wear scar [15,17,[19][20][21]23,25,[28][29][30][31][32][33][34][35][36][37][40][41][42][43]…”

Section: Surface Characterisationmentioning

confidence: 99%

A Review of Ionic Liquid Lubricants

et al. 2013

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Due to ever increasing demands on lubricants, such as increased service intervals, reduced volumes and reduced emissions, there is a need to develop new lubricants and improved wear additives. Ionic liquids (ILs) are room temperature molten salts that have recently been shown to offer many advantages in this area. The application of ILs as lubricants in a diverse range of systems has found that these materials can show remarkable protection against wear and significantly reduce friction in the neat state. Recently, some researchers have shown that a small family of ILs can also be incorporated into non-polar base oils, replacing traditional anti-wear additives, with excellent performance of the neat IL being maintained. ILs consist of large asymmetrical ions that may readily adsorb onto a metal surface and produce a thin, protective film under boundary lubrication conditions. Under extreme pressure conditions, certain IL compounds can also react to form a protective tribofilm, in particular when fluorine, phosphorus or boron atoms are present in the constituent ions.

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Section: Surface Characterisationmentioning

confidence: 99%

A Review of Ionic Liquid Lubricants

et al. 2013

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“…Material pairs such as steel/steel, steel/SiO 2 , steel/aluminium, steel/copper, steel/Si(100), steel/sialon, steel/titanium, sialon/Si 3 N 4 and steel-PVD coatings (TiN, DLC and CrN) have been explored using pyridinium, imidazolium, phosphonium or ammonium as cation combined with anions such as hexafluorophosphate (PF 6 ), tetrafluoroborate (BF 4 ), CF 3 SO 3 , (C 2 F 5 ) 3 PF 3 (or FAP) and (CF 3 SO 2 ) 2 N (or NTf 2 ) [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. The most common anions examined in the tribology literature are BF 4 and PF 6 , but their hydrolytic instability and tendency to produce corrosive HF have been reported [27].…”

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confidence: 99%

Ionic liquids as an additive in fully formulated wind turbine gearbox oils

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González

Battez

et al. 2015

Wear

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“…A lot of researches have been published concerning the use of ionic liquids as lubricants since 2001 [29], proving their remarkable potential for this purpose [4,6,[30][31][32]. At the beginning, imidazolium-based ionic liquids with [PF 6 ] and [BF 4 ] anions were widely used [33][34][35]. Despite their good tribological behaviour, the hydrolysis products of those anions are highly corrosive [36].…”

Section: Introductionmentioning

confidence: 99%

Isoconversional kinetic analysis applied to five phosphonium cation-based ionic liquids

et al. 2017

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Thermal degradation of five phosphonium cation-based ionic liquids ([P 66614 outperforming the other ones in both pyrolytic and oxidising conditions. Although the thermal degradation mechanism is affected by atmospheric conditions, the degradation trend remains practically constant. As the dynamic methodology usually overestimates the long-term thermal stability, an isoconversional methodology is better for predicting the long-term thermal stability of these ionic liquids in order to be used as base oil or additive in lubricants formulation. Finally, the model-free methodology can predict at lower costs the ILs performance in isothermal conditions. Highlights• Weakly coordinating anions provoke good thermal stability of ILs.• • Isoconversional methods are better than dynamic ones for long-term thermal studies.• Activation energy behavior at low conversions is related to a single reaction.• Model-free methodology can predict the ILs performance in isothermal conditions.

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Tribological behaviour of two imidazolium ionic liquids as lubricant additives for steel/steel contacts

Cited by 139 publications

References 20 publications

A Review of Ionic Liquid Lubricants

A Review of Ionic Liquid Lubricants

Ionic liquids as an additive in fully formulated wind turbine gearbox oils

Isoconversional kinetic analysis applied to five phosphonium cation-based ionic liquids

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