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1- N-alkyl -3-methylimidazolium ionic liquids as neat lubricants and lubricant additives in steel–aluminium contacts

Jiménez, A.E. ; Bermúdez, M.D. ; Iglesias, P. ; Carrión, F.J. ; Martínez-Nicolás, G.

Wear, 2006-04, Vol.260 (7), p.766-782 [Periódico revisado por pares]

Lausanne: Elsevier B.V

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  • Título:
    1- N-alkyl -3-methylimidazolium ionic liquids as neat lubricants and lubricant additives in steel–aluminium contacts
  • Autor: Jiménez, A.E. ; Bermúdez, M.D. ; Iglesias, P. ; Carrión, F.J. ; Martínez-Nicolás, G.
  • Assuntos: Additives ; Aluminium ; Applied sciences ; Base oils ; Contact of materials. Friction. Wear ; Exact sciences and technology ; Friction, wear, lubrication ; Ionic liquids ; Machine components ; Mechanical engineering. Machine design ; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology ; Metals. Metallurgy ; Steel ; Tribocorrosion
  • É parte de: Wear, 2006-04, Vol.260 (7), p.766-782
  • Notas: ObjectType-Article-2
    SourceType-Scholarly Journals-1
    ObjectType-Feature-1
    content type line 23
  • Descrição: The influence of the alkyl chain length and of the anion on the lubricating ability has been studied for the room-temperature ionic liquids (IL) 1- n-alkyl-3-methylimidazolium X − [ X = PF 6; n = 6 (L-P106). X = BF 4; n = 2 (L102), 6 (L106), 8 (L108). X = CF 3SO 3; n = 2 (L-T102). X = (4-CH3C6H4SO3); n = 2 (L-To102)]. Neat IL have been used for AISI 52100 steel-ASTM 2011 aluminium contacts in pin-on-disk tests under variable sliding speed. While all IL give initial friction values lower than 0.15, real-time sharp friction increments related to tribochemical processes have been observed for L102 and L-P106, at room-temperature and at 100 °C. Electronic microscopy (SEM), energy dispersive (EDS) and X-ray photoelectron (XPS) spectroscopies show that wear scar surfaces are oxidized to Al 2O 3 and wear debris contain aluminium and iron (for L102) fluorides. For L-P106, the steel surface is covered with a P-containing tribolayer. A change of anion (L-T102; L-To102) reduces friction and wear, but the lowest values are obtained by increasing the alkyl chain length (L106; L108). When the more reactive L102 and L-P106 are used as 1 wt.% base oil additives at 25 °C, tribocorrosion processes are not observed and a friction reduction (69–75% for 1 wt.% L102) and a change from severe (10 −3 mm 3 m −1) to mild wear (10 −4 to 10 −6 mm 3 m −1) is obtained with respect to the neat IL. 1 wt.% IL additives also show good lubricating performance at 100 °C.
  • Editor: Lausanne: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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