Abstract: Molybdenum disulfide solid lubrication coating is prepared on the surface of LZ50 steel by bonding technology. Rotational fretting wear tests of the coating and its substrate are carried out under different angular displacement amplitudes. Dynamic analyses combination with microscopic examinations through optical microscopy, scanning electric microscope and surface profilometer are performed. The result indicate that rotational fretting regimes of coating and its substrate are only partial slip regime(PSR) and slip regime(SR). No mixed fretting regime could be observed for them. Fretting regimes of coating are changed, the range of the PSR is diminished, and the SR shift to the direction of smaller angular displacement amplitude. Compared with the substrate, friction coefficient is always lower than that of the substrate during the whole fretting cycles due to lubricating effect coming from the coating. The damage in the PSR is very slight, but in the SR, the damage mechanism of the coating is mainly delamination and tribo-oxidation. In summary, the bonded MoS2 solid lubricant coating has a significant protective effect, and presents a better capability for alleviating rotational fretting wear.

Key words: Bonded molybdenum disulfide solid lubrication coating, Fretting wear, Friction wear, Rotational fretting