Synergistic effect of phosphorus based ionic liquids combined with nano two-dimensional α-ZrP on the tribological properties and mechanisms

Sulfur free and environmentally friendly lubrication additives have been widely concerned in industrial applications. In this work, the α-Zirconium phosphate (α-ZrP) with two-dimensional nanomaterials and trioctyldodecyl phosphonium diisooctyl phosphate (P/P) were respectively prepared. Then, the composite lubricating additives containing P/P with α-ZrP were obtained. The synergistic effect of α-ZrP with P/P on the tribological properties in paraffin oil were systematically investigated. The results indicated that 1 %P/P@1000 α-ZrP additive exhibited excellent anti-friction and anti-wear properties. The improved tribological properties could be mainly attributed to the fact that the slip action of α-ZrP and its pronounced synergy effect with P/P on the friction film on the metal surface, forming a dual-layered lubrication film and greatly reduced the shear wear and abrasive wear.