In this work, we prepared two environmentally friendly sulfur- and phosphorus-free organic molybdenums, MODE and MGMO, which show excellent wear resistance and improve the tribological properties of PAO 6 by combining with traditional zinc dialkyldithiophosphate (ZDDP). The synthesized additives show good wear resistance with the decreasing WSD by 35.3% and 38.7% for MODE and MGMO, respectively. However, they exhibit no friction-reducing property but increase the COF. Furthermore, MODE and ZDDP have excellent synergistic effects on both friction-reducing and antiwear, decreasing the COF and WSD by 31.6% and 39.3%, respectively, which is attributed to the composite tribofilm composed of MoS₂, MoO₃, molybdate, sulfide and sulfate generated during the friction process. Our results indicate that the S- and P-free organic molybdenums with prominent tribological performance could be used as environmentally friendly lubricating materials to totally/partially replace ZDDP.

在这项工作中，我们制备了两种环保的无硫无磷有机钼 MODE 和 MGMO，它们与传统的二烷基二硫代磷酸锌 (ZDDP) 结合，表现出优异的耐磨性并改善了 PAO 6 的摩擦学性能。合成的添加剂显示出良好的耐磨性，MODE 和 MGMO 的 WSD 分别降低了 35.3% 和 38.7%。然而，它们没有表现出降低摩擦的特性，但增加了 COF。此外，MODE和ZDDP在减摩和抗磨方面具有优异的协同作用，分别降低了31.6%和39.3%的COF和WSD，这归因于由MoS ₂、MoO ₃组成的复合摩擦膜、钼酸盐、硫化物和硫酸盐在摩擦过程中产生。我们的研究结果表明，具有突出摩擦学性能的不含 S 和 P 的有机钼可用作环保润滑材料，以完全/部分替代 ZDDP。