中文摘要：

利用四球摩擦磨损试验机评价了合成的5-甲基硫基-2-（2’-羟基-3’-正辛基黄原酸基）-丙基硫基-1,3,4-噻二唑（OMP）作为润滑添加剂在加氢油5 Cst中的摩擦学性能，测试结果显示所合成的噻二唑衍生物能够有效提高5 Cst基础油的摩擦学性能，并且在其添加浓度为2.0 wt%时，能提高基础油极压值的2.7倍，降低基础油磨斑直径30%和减少摩擦系数20%，减摩性能均随着添加剂OMP浓度的增加而增加。通过扫描电镜（SEM）分析了摩擦后钢球表面形貌及元素分布，发现添加剂中所含的活性N，S元素在摩擦过程中形成的含硫、氮和氧的边界膜是添加剂具有良好的摩擦学性能的主要原因。

英文摘要：

The tribological performance of synthesized 5-methylthio-2-（2’- hydroxyl-3’-octyl xanthate-yl-propyl-thio-1,3,4-thiadiazole （OMP） was investigated by the four-ball tester in hydrogenated oil 5 Cst. Test re-sults show that the synthesized thiadiazole derivative can effectively improve the tribological properties of 5 Cst, and it can increase the PB value by 2.7 times, and decrease 30% WSD and 20% friction coefficient of base oil when the OMP concentration is 2.0 wt%. Along with the OMP concentration increasing, the extreme pressure, antiwear and friction-reducing performance increases when the OMP concentration is below 2.0 wt%. The sur-face morphology and element distribution of worn steel ball surface were analyzed by using scanning electron mi-croscopy （SEM）, and it found out that the S and N elements in thiadiazole formed the boundary film containing S, O, N elements during the tribological process, and it is the main reason for OMP to possess the good tribological performance.