Protic Ionic Liquids with Ammonium Salts as Lubricants for Magnetic Thin Film Media

Abstract

The newly synthesized perfluoropolyether (PFPE) whose terminal group is an ammonium salt with a carboxylic acid has better frictional and anti-corrosion properties when compared to the conventional PFPEs. The friction is almost independent of the PFPE structure, but depends on the amine structures. This modified PFPE uniformly covers the magnetic surfaces; this is why it not only reduces the friction, but also has an effect on the corrosion resistance.

Protic Ionic Liquids Used as Metal-Forming Green Lubricants for Aluminum: Effect of Anion Chain Length

“…Also, this chain is completely linear, without branches. Hence, this 2HEAPe longer anion chain was capable of stress dissipation, which reduced the coefficient of friction, as well as heteroatoms, capable of interacting with the metals 16,19,20,[60][61][62] , which aided to maintain the tribofilm in place along the experiment. 2HEAF, the PIL with the simplest structure and one carbon in the anion chain, could not reduce adhesion and yielded coefficient of friction similar as in the absence of lubricant in the ball-on-plate test, reflected in the impossibility to deform the aluminum 1100 as expected for the BUT test and in the stress concentration that provoked the rupture.…”

“…The most significant weight loss for the commercial lubricant started at 295 ºC, temperature at which the alkyl backbone rupture started. This thermal behavior is consequence of the high density of alkyl functions belonging to the hydrocarbon backbone, whose covalent carbon-carbon bonds need high energy amounts to be broken 16 . Table 3 shows the aforementioned water content and the physical-chemical properties of the fluids studied in this research.…”

“…Research of protic ionic liquids as lubricants saw the light when lubrication with perfluoropolyether (PFPE)-ammonium-based protic ionic liquid for nickel-cobalt contacts was tested by Kondo 16 for application in magnetic thin film media. More recent studies [17][18][19][20] have dealt with lubrication using different kinds of ionic liquids, focused on ammonium and imidazolium-based ones.…”

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

“…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].…”

TGA–FTIR study of the vapors released by triethylamine–acetic acid mixtures

“…Appropriate mixtures of amines and carboxylic acids can provide both short-and long-term protection against metal corrosion during storage and transportation [5,[9][10][11]. This class of VCIs is mainly used for the protection of mild steel and iron [3,9].…”