Effects of oxygen on the load-carrying action of some additives

Evaluation of water glycol hydraulic fluids: a tribological approach

“…To reveal the topography and shape of the scars produced, scanning electron microscopy (SEM) was used [10]. The balls subjected to scans were those obtained just before the weld load on the fourball tester.…”

Shear-driven reactions of organosulfur compounds on ferrous surfaces: A molecular dynamics study

“…Experimental studies of reactions between disulfides and ferrous surfaces have shown that reaction rates are lower on oxide surfaces. [79,80,81] The H-passivated Fe 2 O 3 surface was passivated with H in the simulations, prior to introducing the additive molecules, making it even more chemically stable. [82] Lastly, Fig.…”

Boundary and Extreme Pressure Lubrication

“…In a study of sulphide films on steel surfaces, it was found that the product of several hours corrosion by sulphur on steel, i.e., a thick sulphide film, was destroyed by less than 20 passes of a steel slider [97] which in high-speed sliding contacts would last for about one second or less. Oxygen may also suppress excessive corrosion by EP additives since it was found that removal of oxygen from a lubricated system caused a more severe sulphidization without any increase in maximum load capacity [98]. The heat of adsorption of fatty acids on iron sulphide is raised considerably by a small amount of oxidation [97].…”