Tribological properties of YG8/steel friction pair in an aqueous lubrication system with an ionic liquid: Experimental results and molecular dynamics simulations

In this work, an ionic liquid (G-RIC) with excellent lubricating performance was successfully prepared, and the tribological properties as an additive in glycerol-water solutions were explored. The results indicated that 2.0 % additive content can reduced the friction coefficient to below 0.1, leading to a decline in the wear volume of 76 %. Gray cast iron corrosion tests revealed that the additive exhibited excellent corrosion resistance. Quantum chemical calculations revealed that the anion RIC has a low energy gap (ΔE = 0.034 Ha), which implies that it is more prone to undergoing tribochemical reactions with the metal substrate under frictional heat. The synergistic action of the liquid lubrication layer, adsorption film, and friction protective film created an interface that easily shears. [Display omitted] •Ionic liquid G-RIC showed potential as a functional additive for cutting fluids.•Additive in glycerol-water enhances anti-friction/anti-wear properties of YG8/steel.•The ionic liquid exhibits excellent anti-corrosion behavior in pure water solution.•Low energy gap (ΔE=0.034 Ha) and strong adsorption of anion improve lubrication.•Low shear stress via tribofilm, adsorption film and liquid lubrication film synergy.