Tribological Behaviors of Graphene and Graphene Oxide as Water-Based Lubricant Additives for Magnesium Alloy/Steel Contacts

Abstract

The tribological behaviors of graphene and graphene oxide (GO) as water-based lubricant additives were evaluated by use of a reciprocating ball-on-plate tribometer for magnesium alloy-steel contacts. Three sets of test conditions were examined to investigate the effect of concentration, the capacity of carrying load and the endurance of the lubrication film, respectively. The results showed that the tribological behaviors of water can be improved by adding the appropriate graphene or GO. Compared with pure deionized water, 0.5 wt.% graphene nanofluids can offer reduction of friction coefficient by 21.9% and reduction of wear rate by 13.5%. Meanwhile, 0.5 wt.% GO nanofluids were found to reduce the friction coefficient and wear rate up to 77.5% and 90%, respectively. Besides this, the positive effect of the GO nanofluids was also more pronounced in terms of the load-carrying capacity and the lubrication film endurance. The wear mechanisms have been tentatively proposed according to the observation of the worn surfaces by field emission scanning electron microscope-energy dispersive spectrometer (FESEM-EDS) and Raman spectrum as well as the wettability of the nanofluids on the magnesium alloy surface by goniometer.

Black phosphorus quantum dots: A new-type of water-based high-efficiency lubricant additive

“…However, the increase in the contact area was lower than that of the load. In comparison with previously reported carbon/graphene quantum dots [57][58][59], colloidal polystyrene-carbon nanotubes [60], and graphene oxides [61,62], BPQDs possess a much better loadsupporting capacity under identical experimental conditions, even when using a small additive c of 0.005 wt%. For comparison purposes, BP powder was also utilized as additive of the base liquid to further highlight the superior performance of BPQDs as additives.…”

Atomic Scale Simulation on the Anti-Pressure and Friction Reduction Mechanisms of MoS2 Monolayer

“…When used as lubricant additives or solid lubricants, graphene and few-layer MoS 2 can improve the extreme pressure (highest load without seizure of the friction pairs) and reduce the friction of rubbing surfaces [ 16 , 17 ]. These excellent lubricating properties, including the anti-pressure effect and friction reduction effect, are usually attributed to the better mechanical properties of 2D materials than metal friction pairs [ 18 ].…”

Research Progress in Application of 2D Materials in Liquid-Phase Lubrication System

“…Adding a good water-lubricant additive can significantly improve the water-lubricant performance [103,104,105,106]. At present, the excellent lubricating properties of 2D materials as additives in the field of water lubrication has attracted great interest [107,108,109,110,111,112].…”

“…Water lubrication holds the advantages of environmental protection, energy conservation and excellent heat conduction properties. Adding a good water-lubricant additive can significantly improve the water-lubricant performance [ 103 , 104 , 105 , 106 ]. At present, the excellent lubricating properties of 2D materials as additives in the field of water lubrication has attracted great interest [ 107 , 108 , 109 , 110 , 111 , 112 ].…”