Effect of ageing on lubricants’ physical and chemical properties and tribological performance

Abstract

Purpose The purpose of this study is to evaluate the effect of water contamination on ageing of lubricants. Design/methodology/approach The viscosity, total acid number and Fourier transform infrared spectrum of a series of lubricants after ageing with water were studied. The tribological performance (friction and wear) of the aged lubricants was also analyzed, followed by X-ray photoelectron spectroscopy analysis on the selected post test samples to study the tribochemical features of the tribofilm. Findings The results were also compared with Part I of this study, and it was found that ageing has a different impact on lubricants and tribological performances based on the physical and chemical properties when water is present in the lubricants. Originality/value This paper is a continuation of Part I of this study and gives an understanding on the impact of water on the lubricants and related tribological and tribochemical performance.

Minimizing Toxicity and Optimizing Lubricity of Ionic Liquids for Eco-Friendly Lubrication

“…We understand that a lubricant’s chemistry could change significantly in use due to thermal decomposition, oxidation, hydrolysis, and reactions with the contaminants from the environment and wear debris. Several literature reports have been published on the aging effects of conventional lubricants, − and quite a few studies exist on the chemical stabilities of various IL compounds. , The effect of aging on the toxicity and lubricity of this new group of eco-friendly ILs will be investigated in our future work.…”

Effect of droplet size on the film formation of O/W emulsion

“…However, the low flash point, high flammability (Mushrush et al , 2006) and poor thermal conductivity of oil-based lubricants make them unsuitable for certain fire and explosion hazard situations (Wang et al , 2011). Therefore, water-based lubricants (Meng et al , 2020; Xiao et al , 2017; Xiao et al , 2019; Espinosa et al , 2014; Cen et al , 2019) have been widely concerned by researchers. Compared to petroleum, water alone is a poor lubricant due to its low viscosity and its tendency to corrode metal surfaces.…”