Insight into degradation of ammonium-based ionic liquids and comparison of tribological performance between selected intact and altered ionic liquid

Understanding the thermal decomposition mechanism of a halogen-free chelated orthoborate-based ionic liquid: a combined computational and experimental study

“…5 The obtained decomposition products were analyzed by means of X-ray photoelectron spectroscopy (XPS), mass spectrometry (MS) and white light confocal microscopy. 3,4 The versatility of using the TGA-MS technique for studying IL systems was also verified by other research groups. [6][7][8][9] An interesting method was reported by Anderson et al 10 for studying the thermal stability of ILs deposited in fused silica capillaries.…”

Toward resolving anxiety about the accelerated corrosive wear of steel lubricated with the fluorine-containing ionic liquids at elevated temperature

“…A great number of research papers focusing on these characteristics have been published in the field of tribology research. Some studies of ILs focusing on the tribological performance as lubricants have examined high-temperature usage [2][3][4][5][6][7][8][9][10], under high vacuum [11][12][13][14][15][16], application for the lubrication of non-ferrous metal or non-metallic materials [7,17,18], bulk viscosity characteristics [19][20][21], thermal degradation [22,23], tribofilm formation [13,24,25], corrosion [22,26,27], and more.…”

Tribochemistry and thermo-oxidative stability of halogen-free ionic liquids

“…It was suggested that the altered products from the ILs can negatively inuence their tribological performance due to thermal degradation. 24 While our previous results obtained using alkylboraneimidazole complexes blended with phosphonium phosphate IL as additive are promising, 32,33 this current study reports new insights regarding the thermo-oxidative stability and fundamental changes in the tribolm's composition that have a positive impact on the ILs tribological performance at elevated temperatures. It has been reported previously that iron phosphide tribolms which are occasionally formed from phosphonate esters improve the anti-wear properties of lubricants.…”

“…15 Several types of RTILs with imidazolium, ammonium, phosphonium, pyridinium, pyrrolidinium, etc., as cations and halides, hexauorophosphate (PF 6 À ), tetrauoroborate (BF 4 À ), perchlorate (ClO 4 À ), bis(pentauoroethanesulfonyl)imide (BETI À ), bis(triuoromethylsulfonyl)imide (NTf 2 À ), tris(penta-uoroethyl)triuorophosphate (FAP À ), etc., as anions have been evaluated for their tribological properties, [1][2][3][4][5][6][16][17][18][19][20][21] thermal stability and corrosiveness. [22][23][24][25] Most imidazolium and ammonium salts with shorter alkyl chains tend to absorb water when exposed to moisture. 26 Moreover, it has been reported that the decomposition of halogen containing anions (especially PF 6 À and BF 4 À ) either under tribological conditions or via hydrolysis by water trapped molecules yields hazardous by-products (HF, etc.)…”