The effect of CrO3 on the friction and wear of MoS2 transfer film

The oxidizer CrO3 was added into MoS2 powder for changing the compositions of the oxides and sulfides formed on the metal surface in reciprocating motion, the wetting behavior of the rubbing pin surface was investigated with respect to the zero transfer film by sessile contact angle method. The low energy Auger spectra of iron, the binding energies of Fe2p3/2 and S2p indicate that a transfer film was formed on the pin surface with MoS2+CrO3(2%wt) lubricating. In the transfer film, iron oxide existed as Fe3O4, sulfide existed as FeSO4. The lower friction coefficient and wear rate of pin with MoS2+CrO3 lubricating were obtained compared with MoS2 lubricating. It is found that Fe3O4 on the steel surface can promote the formation of MoS2 transfer film under light load and moderate reciprocating speed.