Tribological behaviour of two imidazolium ionic liquids as lubricant additives for steel/steel contacts |
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| Authors: | A. Hernández Battez R. González J.L. Viesca D. Blanco E. Asedegbega A. Osorio |
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| Affiliation: | 1. University of Oviedo, Department of Mechanical and Civil Engineering, Ctra. de Castiello s/n, 33204 Gijon, Spain;2. University of Oviedo, Department of Chemical Engineering, C/Julian Claveria, 8. 33006 Oviedo, Spain;1. State Key Laboratory of Tribology, Tsinghua University, Beijing, 100084, China;2. Department of Engineering Mechanics, Tsinghua University, Beijing, 100084, China;3. Institute of Applied Mechanics, Zhejiang University, Hangzhou, Zhejiang, 310027, China;1. Department of Chemical & Environmental Engineering, Faculty of Engineering, University of Nottingham, Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor, Malaysia;2. Energy Research Division, Taylor?s University, Lakeside Campus, 47500 Subang Jaya, Selangor, Malaysia;3. Apar Industries Limited, Apar House, Corporate Park, Chembur, Mumbai 400071, India;4. Department of Civil Engineering, Faculty of Engineering, University of Nottingham, Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor, Malaysia;1. Division of Mechanical and System Engineering, Graduate School of Nature Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-Ku, Okayama 700-8530, Japan;2. Research Core for Interdisciplinary Sciences, Okayama University, 3-1-1 Tsushimanaka, Kita-Ku, Okayama 700-8530, Japan;1. Materials Science and Technology Division, Oak Ridge National Laboratory, PO Box 2008, Oak Ridge, TN 37831-6063, United States;2. Energy and Transportation Science Division, Oak Ridge National Laboratory, TN, United States;3. Chemical Sciences Division, Oak Ridge National Laboratory, TN, United States;4. Research & Development Center, General Motors Corp, Detroit, MI, United States |
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| Abstract: | In this paper two room-temperature ionic liquids (ILs), 1-hexyl-3-methylimidazolium tetrafluroborate [HMIM][BF4] and 1-hexyl-3-methylimidazolium hexafluorophosphate [HMIM][PF6], have been studied as 1%wt. additives of a mineral hydrocracking oil for steel–steel contacts. Rheological properties of the mixtures and base oil were determined over shear rates and temperatures ranging 1–1000 s?1 and 40–100 °C, respectively. Friction and wear testing was made using a block-on-ring tribometer set for pure sliding contact and XPS was used to analyze wear surfaces. [HMIM][PF6] and [HMIM][BF4] increased the viscosity of the base oil and decreased friction and wear. Friction and wear reduction are related to reactivity of the anion of the ionic liquids with surfaces forming FeF3, B2O3, and species such as P2O5 or PO43?. |
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