Journal
TRIBOLOGY INTERNATIONAL
Volume 92, Issue -, Pages 353-364Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2015.07.009
Keywords
Ionic liquids; Tribofilms; XANES; Wear; Friction
Categories
Funding
- Canadian Foundation for Innovation
- Natural Sciences and Engineering Research Council of Canada
- University of Saskatchewan
- Government of Saskatchewan
- Western Economic Diversification Canada
- National Research Council Canada
- Canadian Institutes of Health Research
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Mechanism of tribofilm formation with two ionic liquids (IL), choline bis(2-ethylhexyl)phosphate and choline dibutyldithiophosphate was studied. XANES analysis of tribofilms indicates that the underlying mechanism of tribofilm formation with ionic liquids is similar to that formed when ZDDP is used. The chain length of glassy polyphosphates with IL in base oil is longer in length in comparison to that formed with ZDDP under identical conditions indicating a higher level of networking. In fully formulated oils, Ca replaces Zn and Fe (in the case of ZDDP) or Fe (when IL's are used) as the primary cationic species present in the polyphosphate network. The sulfur is present in the form of sulfates of different cationic species including Fe and Ca. (C) 2015 Elsevier Ltd. All rights reserved.
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