清净剂对含ZDDP/MoDTC的基础油清净性及抗磨性能的影响

为了考察清净剂对含二烷基二硫代磷酸锌(ZDDP)和二硫代氨基甲酸钼(MoDTC)组合抗磨减摩剂的基础油的影响，将高碱值合成磺酸钙(T106D)、高碱值合成磺酸镁(T107)、高碱值硫化烷基酚钙(T115B)作为清净剂分别按一种或几种添加到含ZDDP/MoDTC的基础油中，对油样进行曲轴箱模拟试验和四球机抗磨试验，并采用高倍扫描电镜（SEM）对油样试验件的钢球表面形貌进行表征。结果表明：曲轴箱模拟试验时间越长，清净剂对基础油的成焦抑制差异越明显，同时添加3种清净剂时ZDDP/MoDTC复配基础油具有最好的清净性，其中含有T107的基础油具有更低的成焦倾向；曲轴箱模拟试验后的油品进行四球机抗磨试验表明，3种清净剂对ZDDP/MoDTC复配基础油抗磨性能影响较小，引起抗磨性能变化的主要原因是MoDTC经高温后的稳定性下降；SEM对钢球表面形貌表征结果表明，清净剂会减弱ZDDP/MoDTC复配基础油对钢球试验件摩擦副表面的润滑修复作用。

EFFECT OF DETERGENT ON DETERGENCY AND WEAR RESISTANCE OF BASE OIL CONTAINING ZDDP/MODTC COMPOUND

In order to investigate the effect of detergent on the performance of base oil containing zinc dialkyldithiophosphate(ZDDP) and molybdenum dithiocarbamate(MoDTC) as anti-wear and anti-friction agents, overbased synthetic calcium sulfonate(T106D)，overbased synthetic Magnesium sulfonate(T107), or alkylphenolate calcium sulfide (T115B) was added to the base oil containing composite ZDDP/MoDTC, respectively. The crankcase simulation test and four-ball machine wear resistance test were carried out. The high magnification scanning electron microscope(SEM) was used to characterize the surface morphology of steel ball after test. The results showed that the longer the crankcase simulation test time, the more obvious the difference in the base oil coking inhibition, and the addition of 3 detergents at the same time had the best detergency for the base oil with composite ZDDP/MoDTC. The base oil containing T107 had a lower coking tendency. The anti-wear test using the four-ball machine after the crankcase simulation test showed that the three detergents had little effect on the anti-wear performance of the base oil containing ZDDP/MoDTC compound. The main reason for the change in anti-wear performance was the decrease in the stability of MoDTC after high temperature. SEM results of the surface morphology of the steel ball showed that detergent would weaken the recovery effect of ZDDP/MoDTC compound base oil on the friction surface.