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 |
| URN: | urn:nbn:de:bsz:291:415-1647 |
| DOI: | https://doi.org/10.3390/lubricants7030027 |
| Parent Title (English): | Lubricants |
| Volume: | 7 |
| Issue: | 27 |
| First Page: | 1 |
| Last Page: | 15 |
| Language: | English |
| 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): |  Creative Commons - CC BY - Namensnennung 4.0 International |
