Behavior and interaction of boundary lubricating additives on steel and DLC-coated steel surfaces

Tribofilm formation and frictional performance of lubricant additives — oleamide, ZDDP and their mixture formulated in PAO — on steel and diamond-like carbon (DLC)-coated steel surfaces was studied under severe boundary lubrication conditions. The binary additive system reduced friction to a greater extent compared to the individual additives for all the surfaces. Chemical composition analysis of the tribofilms using surface spectroscopic...