The Effect of Additive Chemical Structure on the Tribofilms Derived from Varying Molybdenum-Sulfur Chemistries

Abstract Molybdenum disulfide (MoS 2 ) is an effective friction modifier that can be formed on surfaces from oil-soluble lubricant additives. Different additive chemistries used to form MoS a surface. The tribofilms three different molybdenum additives (MoDTC Dimer, MoDTC Trimer, and molybdate ester) were studied in monoblends fully formulated systems. resulting then characterized by Raman spectroscopic spatial mapping, XPS, FIB-TEM. distribution of the surface was much more sparse for ester than other No crystalline oxides observed spectroscopy, but their presence inferred XPS analysis. analysis showed very similar distributions Mo oxidation states each additive, such chemical nature films all likely similar. Each have 3 vibrations persulfide peaks associated with amorphous , as this species presented common frictional decomposition product trimer able produce contacting due its structural similarities co-ordination polymer . Graphical