This paper reports on the synthesis and tribological performance of N‐ZDDP, a type of additive containing nitrogen, that is O,O‐diaryl‐N‐methylene‐O,O‐zinc dialkyldithiophosphate, synthesised by Mannich and other reactions, and useful for improving antioxidation and anticorrosion behaviour in hydraulic, gear, and engine oils. Compared with conventional zinc dialkyldithiophosphate (ZDDP), N‐ZDDP widens the thermal decomposition temperature range, and its antioxidant behaviour is improved by 40%, and its anticorrosion properties by 50%. The load‐carrying capacity of N‐ZDDP is superior to that of ZDDP; its wear resistance, however, is similar to that of ZDDP.

This paper summarizes the tribological properties of MoS2 nano-particles with about 30 nm under different frictional conditions. By four-ball tribometer, the results showed that as the nano-MoS2 content is over 0.5 wt% the extreme pressure of lubricating oil is higher than to 30% than that of lubricating oil with same content of common MoS2. The nano-MoS2 particles can decrease the friction coefficient of lubricating oil obviously. However the results showed that their friction reductions have not obvious difference by the ring-on-block tribometer. The analyses of surface composition conducted by XPS and SEM images showed that the nanoparticles form a protective film (WO3) allowing an increase in the load capacity of rubbed pairs. The main advantage of the nanoparticles is ascribed to the release and furnishing of the nanoparticles from the valley onto the rubbing metal surface and their confinement at the interface.