Journal
TRIBOLOGY INTERNATIONAL
Volume 160, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2021.107058
Keywords
Ammonium; Protic ionic liquids; Carboxylate; Low viscosity; Halogen-free; Lubricants
Categories
Funding
- center of research in ionic liquids (CORIL) Universiti Teknologi PETRONAS
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The study found that the group of protic ionic liquids as lubricants can significantly reduce the friction coefficient of steel-steel interfaces, with the salicylate protic ionic liquid showing the lowest friction coefficient. Additionally, the 2-naphthoate and salicylate protic ionic liquids in the lubricants exhibited lower wear values compared to polyalphaolefin in the wear test.
The tribological performance of six low viscosity, hydrophobic, halogen- sulfur-, and phosphorous free trioctylammonium-based protic ionic liquids with 2-naphthoate, 4-tert-butylbenzoate, 2-hexyldecanoate, 4-phenylbutanoate, 3,4-dimethylbenzoate, and salicylate anions were studied as lubricants for steel-steel interfaces using a four-ball tribo-tester. The results showed a significant friction reduction up-to 28. 65% compared to polyalphaolefin lube base oil. Where the salicylate protic ionic liquid showed the lowest coefficient of friction. In terms of wear, the 2-naphthoate and salicylate protic ionic liquids exhibited wear scar diameter values lower than polyalphaolefin by 4.7% and 0.42%, respectively. The scanning electron microscopy and X-ray photoelectron spectrometer analysis outcomes of the wear scar surfaces indicated that tribo-chemical reactions were involved among the protic ionic liquid molecules and the steel surfaces during the tribo-test, developing a protective boundary film, which contributed significantly to the lubrication performance of the protic ionic liquids' lubricants. No corrosion was observed for the copper strip corrosion test carried out to examine the corrosion characteristics of the studied protic ionic liquids. The overall results confirm the high capability of applying this group of protic ionic liquids as lubricants.
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