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Ionic Liquids Based on Chromotropic Acid: Excellent Lubricating Additives for Aqueous System

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Abstract

In this paper, four ionic liquids based on chromotropate (CAILs) were prepared and applied to heighten the tribological performance of aqueous system on different metal friction contacts. Taking for the potential choice for water-based lubricating additive, CAILs exhibited excellent water solubility and corrosion resistance. Tribological results showed that the CAILs, especially the phenolic hydroxyl group decorated samples (TsnN4444 and TsnP4444), demonstrating extremely effective lubricating properties with the efficient friction and wear descent (69% and 83% for Fe, 47% and 94% for Cu, 74% and 69% for Al, respectively). Especially, the excellent load-carrying capacity was also presented with the highest PB (833 N) and PD (1568 N) values for TsnP4444. It is speculated that the CAIL molecular adsorption on the interface and further generation of tribochemical films are beneficial for their lubricating effects, resulting from the systematic discussion and analysis of CA, QCM, SEM, XPS, and FIB-TEM tests. However, TsN4444 and TsP4444 showed less effective lubricating performances and poor load-carrying capacities due to tribocorrosion of hydroxyl groups at the interface.

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Acknowledgements

We greatly appreciate the finance funded by the NSFC (Grant No. 52175156 and 52105168), the science and technology project in Shaanxi (Grant No. 2021GY-157), the open project of State Key Laboratory of Solid Lubrication (Grant No. LSL-1812), the Scientific Research Foundation of Shaanxi Provincial Key Laboratory (Grant No. 19JS004) and the Shaanxi Provincial Education Department Foundation (Grant No. 21JP003).

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  1. Shaanxi Key Laboratory of Phytochemistry, College of Chemistry & Chemical Engineering, Baoji University of Arts and Sciences, Baoji, 721013, China

    Peng Wang, Peng Gao, Lin Ma, Ping Wen, Yunyan Han, Rui Dong & Mingjin Fan

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Wang, P., Gao, P., Ma, L. et al. Ionic Liquids Based on Chromotropic Acid: Excellent Lubricating Additives for Aqueous System. Tribol Lett 70, 56 (2022). https://doi.org/10.1007/s11249-022-01585-4

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