Tribological properties of halogen-free ionic liquids
- 11 May 2012
- journal article
- research article
- Published by SAGE Publications in Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology
- Vol. 226 (11), 891-902
- https://doi.org/10.1177/1350650112446276
Abstract
The tribological properties of halogen-free ionic liquids, tricyanomethanide [ ] salt, tetracyanoborate [ ] salts, and N-alkylimidazole-trialkylborane complexes were evaluated by laboratory tribo-testing of steel–steel contact under boundary conditions. Tricyanomethanide salt is composed of hydrogen, carbon, and nitrogen. The other two types of liquids are composed of hydrogen, boron, carbon, and nitrogen. They are free of halogens and heavier elements that are components of common ionic liquids, such as fluorine, phosphorus, and sulphur. As expected, the halogen-free ionic liquids exhibited low corrosion properties to steel. When evaluated as neat liquid, these halogen-free ionic liquids provided less tribological properties in comparison with a reference, 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide. Tributylmethylphosphonium dimethylphosphate was examined as a prototype tribo-improving additive. It improved the wear-preventing properties and friction reducing properties of tetracyanoborate salts by 10–25% and 20–30% at a concentration of 10 mM (620 ppm of phosphorus), respectively. The additive performances for tricyanomethanide salt and the imidazole-trialkylborane complexes were not uniform under these conditions. Boron oxide and iron oxides were found by surface analysis of rubbed surfaces with tetracyanoborate salts.
Keywords
This publication has 37 references indexed in Scilit:
- Ionic liquids: a pathway to environmental acceptabilityChemical Society Reviews, 2011
- Physicochemical Properties of an Ionic Liquid [C2mim][B(CN)4]Journal of Chemical & Engineering Data, 2010
- Corrosion Resistance of Steel in Ethanol Containing Ionic Liquid SaltsCorrosion, 2009
- On the Chemical Stabilities of Ionic LiquidsMolecules, 2009
- Ionic Liquids as Advanced Lubricant FluidsMolecules, 2009
- Ionic Liquids in TribologyMolecules, 2009
- Effect of anion on micro/nano-tribological properties of ultra-thin imidazolium ionic liquid films on silicon waferColloids and Surfaces A: Physicochemical and Engineering Aspects, 2009
- Applications of ionic liquids in the chemical industryChemical Society Reviews, 2007
- Nonlinear, Resonance‐Stabilized Pseudohalides: From Alkali Methanides to Ionic Liquids of MethanidesEuropean Journal of Inorganic Chemistry, 2006
- Influence of chloride, water, and organic solvents on the physical properties of ionic liquidsPure and Applied Chemistry, 2000