Abstract
An oil-soluble sulfur- and phosphorus-free organic molybdate ester (ME) was synthesized. The antiwear and friction-reducing properties of ME with zinc dialkyldithiophosphate (ZDDP) in base oils were evaluated by four-ball tester. The results show that ME addition effectively reduced wear scar diameter (WSD) and friction coefficient ( μ) as well as good antiwear synergism with ZDDP. The topography, composition and chemical states of typical elements on the worn scar were analyzed by scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) and X-ray photoelectron spectrometer (XPS). Smooth and light topography of worn scar further confirms the good antiwear synergism of ME with ZDDP. EDX and XPS analyses indicate that tribo-chemically boundary films formed on the rubbing surface consist of metal oxides, sulfides and phosphates, leading to enhancement of the antiwear and friction-reducing properties of the lubricants, and that the considerable MoS 2 layer especially plays an important role in improving antiwear and friction-reducing properties of oils. The proposed antiwear mechanism involves a synergy between ME and ZDDP.
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