Selective synergy of 1,3-diketone for different base oil to promote the realization of oil-based superlubricity

The mixed lubricant prepared by mixing 1-(4-ethylphenyl)-nonane-1,3-dione (0206) and chelate (0206-Fe) in a ratio of 4:6 had better tribological properties than 0206. In this study, it was found that the mixed lubricant prepared by mixing alkane lubricants with 0206-Fe(60%) at a ratio of 2:8 can not only achieve superlubricity, but also reduce the wear scar diameter (WSD) of the friction pairs. The mixed solution prepared by the four polar solutions with 0206-Fe(60%) cannot achieve superlubricity. The results of surface analysis and molecular dynamics (MD) simulation showed that the four polar molecules were preferentially adsorbed on the metal surface, occupying the diketone adsorption sites, and the adsorption layer formed by them cannot produce synergistic lubrication with the chelates.