Corrosion activity and solubility in polar oils of three bis(trifluoromethylsulfonyl) imide/bis(trifluoromethylsulfonyl) amide ([NTF 2 ]) anion-based ionic liquids

Abstract

The corrosion behaviour and solubility of three bis (trifluoromethylsulfonyl) , as a component in a mixture with different base oils were analysed. Six polar oils suitable for use in lubrication were utilized as base oil. Solubility tests were performed by using turbidimetry, and corrosion was checked at 4 v/v% by examining the roughness and chemical composition of the surface after 21 days. The results showed that long carbon chains in the cation improve the solubility greatly in diesters and slightly in polyolesters. Corrosion was not detected at this concentration.

Miscibility, corrosion and environmental properties of six hexanoate- and sulfonate-based protic ionic liquids

“…However, the high cost of ILs has limited their use as neat lubricants in comparison to hydrocarbon oils. Because of this, several research works have employed ILs as lubricant additives in base oils [5][6][7][8][9][10][11]. However, the low miscibility in non-polar hydrocarbon oils has been described as their major problem to be used as additives [12,[13][14][15][16][17][18][19].…”

“…The excellent tribological behavior shown by the PILs, together with their cheap synthesis, makes them very interesting candidates for industrial applications. However, some properties such as, their corrosive action on metals [20,21], and their miscibility in different types of base oils [11,13] should be studied before. Besides, it is also necessary to evaluate their biodegradability and toxicity in order to avoid environmental damage if they are released into the aquatic environment.…”

Tribological performance of tributylmethylammonium bis(trifluoromethylsulfonyl)amide as neat lubricant and as an additive in a polar oil

“…and with 99% of purity, was used as a pure lubricant and as an additive at 1.5 wt% in a hydrolytically stable and readily biodegradable diester oil (coded as A1). This concentration was the maximum value found in solubility tests previously made [22]. A Stabinger Viscometer SVM3001 was used for density and viscosity measurements of the lubricant samples (base oil, ionic liquid and the mixture) at temperatures ranging from 15− 100 °C .…”