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Influence of Water on Tribolayer Growth When Lubricating Steel with a Fluorinated Phosphonium Dicyanamide Ionic Liquid

  • This work aims to elucidate the role of environmental humidity on the tribological behavior of steel surfaces lubricated with an ionic liquid comprised of a fluorinated phosphonium cation—tributyl-3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluoro-octyl-phosphonium—and a dicyanamide anion (i.e. N(CN)2−). Ball-on-disk tribotests were carried out at room temperature and at various levels of relative humidity (RH). Water was found to be required to promote the formation of a tribofilm over the contact area. The reaction layer exhibited a patchy morphology, which resembles that observed formed with conventional antiwear additives such as ZnDTP. A surface-chemical analysis of the tribofilm indicated that the tribofilm is composed of fluorides, oxides, and phosphates, pointing to a stress-induced degradation of the ions and corrosion of the sliding counterparts, which is enabled by the presence of water at the sliding interface.

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Document Type:Article
Author:Luigi A. UrtisORCiD, Andrea Arcifa, Peng ZhangORCiD, Junxiao Du, Marzia FantauzziORCiD, Daniel RauberORCiD, Rolf HempelmannORCiD, Tobias KrausORCiD, Antonella RossiORCiD, Nicholas D. SpencerORCiD
Parent Title (English):Lubricants
First Page:1
Last Page:15
Year of first Publication:2019
Release Date:2022/09/20
Tag:ionic liquids; lubrication; mechanochemistry; small-area x-ray photoelectron spectroscopy; tribofilm
Impact:0.536 (2019)
Funding Information:Fondazione Sardegna CUP F72F16003070002
Scientific Units:Structure Formation
DDC classes:600 Technik, Medizin, angewandte Wissenschaften / 660 Technische Chemie
Open Access:Open Access
Signature:INM 2019/051
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International