Study of tribochemical decomposition of ionic liquids on a nascent steel surface

Lü, Renguo; Mori, Shigeyuki; Kobayashi, Kimihiro; Nanao, Hidetaka

doi:10.1016/j.apsusc.2009.03.063

Cited by 44 publications

(43 citation statements)

References 28 publications

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“…Similarly, peaks appear at 400.2 eV in the N 1s XPS spectra; these peaks possibly correspond to nitrogen oxide [18,19]. The peaks of S2p mainly appear at 169.0 eV and can be identified as FeSO 4 , Fe 2 (SO 4 ) 3 and/or -SO 2 [16,20].…”

Section: Surface Analysesmentioning

confidence: 99%

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Lithium-based ionic liquids as novel lubricant additives for multiply alkylated cyclopentanes (MACs)

et al. 2013

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Two lithium-based ionic liquids (ILs, L-C3N3, and L-P3N3) were synthesized and evaluated as novel lubricant additives for multiply alkylated cyclopentanes (MACs). They were found to be approximately 1.0% soluble in MACs at room temperature (RT), whereas traditional ILs, such as 1-ethyl-3-methylimidazolium tetrafluoroborate (L-B102), 1-hexyl-3-methylimidazolium hexafluorophosphate (L-P106), and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (L-F102), could not be dissolved in this base oil. Friction tests indicated that these ILs exhibit excellent friction-reducing and anti-wear properties both at RT and at 100 °C . They can improve the tribological properties of MACs at RT to a greater extent than the commonly used lubricant zinc dialkyldithiophosphate (T204), even at a concentration of 0.1%. The load ramp test showed that MACs with L-C3N3 and L-P3N3 also exhibit high load-carrying capabilities. Scanning electron microscope (SEM) and X-ray photoelectron spectrometer (XPS) results indicated that physical adsorption and complex tribochemical reactions occurred between the ILs and metal surfaces during the sliding process, thereby forming a surface protective film that significantly contributed to the excellent tribological properties of the new ILs.

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Section: Surface Analysesmentioning

confidence: 99%

“…With respect to the steel lubricated by 0.5% L-C3N3 at 100 °C , an additional S 2p peak appears at 161.9 eV, which possibly corresponds to FeS [16,20]. Thus, under the experimental conditions, a precise determination of the exact tribological protective film species on the worn steel surfaces is difficult.…”

Section: Surface Analysesmentioning

confidence: 99%

Lithium-based ionic liquids as novel lubricant additives for multiply alkylated cyclopentanes (MACs)

et al. 2013

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“…According to the SEM-EDS analysis, the oxide film was removed by the sliding under vacuum conditions. This exposed the nascent surface, which functioned as a catalyst [28,33,35,36]. The cyano-based ionic liquids interacted with this nascent surface and underwent catalytic decomposition, during which only the anion was adsorbed on the worn surface because of electrical forces; nascent steel surfaces have positive charges [35,37] The friction coefficients of both the cyano-based ionic liquids in dry air were higher than those in vacuum.…”

Section: Tof-sims Analysis Resultsmentioning

confidence: 99%

Tribological Properties of Cyano-Based Ionic Liquids under Different Environments

Kawada

Sasaki

2018

Tribology Online

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Ionic liquids have been used as novel high-performance lubricants. However, fluorine-based ionic liquids cause corrosion of materials by the formation of FeF 2 and FeF 3 . This study focuses on cyano-based ionic liquids, as they have low corrosion tendencies owing to the absence of fluorine in their structures. However, cyano-based ionic liquids are hydrophilic, and hence, the effect of ambient conditions (e.g., atmospheric moisture) on the tribological properties needs to be investigated. This study reports the tribological properties of two types of cyano-based ionic liquids 1-ethyl-3-methylimidazolium dicyanamide and 1-ethyl-3-methylimidazolium tricyanomethane under air, vacuum, and dry air environments. Their friction coefficients were found to be dependent on the ambient condition. Both the ionic liquids exhibited low friction coefficients in vacuum. The time-of-flight secondary ion mass spectrometry results indicated that the anion was adsorbed on the worn surface under vacuum conditions, and the adsorbed anion exhibited a low friction. In dry air, the cation was adsorbed on the worn surface, and the adsorbed cation exhibited a higher friction coefficient than the adsorbed anion. In air, the cyano-based ionic liquids caused corrosion of the sliding material and exhibited a high friction coefficient, because of the absorption of moisture from air.

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“…This process is promoted by the poor proton abstracting ability of the NTf 2 anion [62]. Previously this model was put forward to explain tribochemical emissions of methane from N-alkylimidazolium bis(trifluoromethanesulfonyl)imide ILs and IL2 [27,44,48]. The ethyl group of PEG could be another precursor of methane.…”

Section: Resultsmentioning

confidence: 99%

“…A new family of experimental techniques that combine tribometry with mass spectrometry or surface sensitive techniques has recently emerged [48][49][50][51][52][53][54]. These new techniques can provide important information on the development of tribochemical processes in the course of a tribological test.…”

Section: Methodsmentioning

confidence: 99%

Time-Resolved Characterization of Dynamic Tribochemical Processes for Dicationic Imidazolium Ionic Liquid

et al. 2017

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Dynamic tribochemical processes for dicationic ionic liquid containing a geminal imidazolium cation head group bridged by a poly(ethylene glycol) and a bis(trifluoromethylsulfonyl)imide anion were studied using time-resolved mechanically stimulated gas emission mass-spectrometry (MSGE-MS). In comparison with similar monocationic imidazolium ionic liquids with short alkyl or long polyether side chains, the dicationic ionic liquid had a lower coefficient of friction on Ti6Al4V alloy and smoother behavior. The analysis of volatile decomposition products suggested multiple tribochemical reactions in which both anionic and cationic moieties are involved. The tribochemical degradation of cations was mainly through the detachment of the side and bridging chains from the imidazolium head groups. The absence of volatile products containing nitrogen implies that the imidazole group remained unchanged. Hydrogen and water desorption were attributed to the reactions of hydrogen fluoride being a product of anion degradation with titanium and titanium oxide, respectively.

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Study of tribochemical decomposition of ionic liquids on a nascent steel surface

Cited by 44 publications

References 28 publications

Lithium-based ionic liquids as novel lubricant additives for multiply alkylated cyclopentanes (MACs)

Lithium-based ionic liquids as novel lubricant additives for multiply alkylated cyclopentanes (MACs)

Tribological Properties of Cyano-Based Ionic Liquids under Different Environments

Time-Resolved Characterization of Dynamic Tribochemical Processes for Dicationic Imidazolium Ionic Liquid

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