不同石墨烯添加量下MoS2基复合涂层的摩擦磨损及耐腐蚀性能

为改善MoS2基固体润滑涂层的摩擦磨损性能和耐蚀性能，制备了不同石墨烯（GE）添加量的MoS2复合涂层，利用HSR-2M摩擦磨损试验机测试了复合涂层的摩擦磨损性能，并分析了其磨损机理，通过极化曲线、交流阻抗谱（EIS）研究了涂层在3.5%NaCl溶液中的电化学腐蚀行为。试验结果表明，0.8-GE/MoS2复合涂层的摩擦磨损和耐腐蚀性能最优，其平均摩擦因数和磨损率分别为0.232和2.379×10-13 m3/(N·m)，较未添加石墨烯的MoS2涂层分别降低了49.56%和43%，腐蚀速率（1.96×10-8 A/cm2）较纯MoS2涂层（5.54×10-6 A/cm2）降低了近2个数量级。石墨烯的二维片状结构具有良好的自润滑性能，在涂层中均匀分布时能有效阻隔腐蚀介质的渗透，因此，石墨烯的添加提高了MoS2基复合涂层的摩擦学性能和耐腐蚀性能，石墨烯的最优添加量为0.8%（质量分数）。

Tribological Properties and Corrosion Resistance of MoS2-based Composite Coatings with Different Graphene Additions

In order to improve the friction and wear performance and corrosion resistance of MoS2-based solid lubricating coatings, MoS2 composite coatings were prepared with different amounts of GE additions. The friction and wear performance of the composite coatings was tested using a HSR-2M friction and wear tester and the wear mechanism was also analyzed. The electrochemical corrosion behavior of the coating when placed in 3.5% NaCl solution was studied by means of polarization curves, the electrochemical impedance spectroscopy. The results show that the 0.8-GE/MoS2 composite coating has the best friction and wear and corrosion resistance: its friction coefficient and wear rate are as 0.232 and 2.379×10-13 m3/(N·m) respectively, which are 49.56% and 43% lower than those of the MoS2 coating without graphene; and the corrosion rate(1.96 ×10-8 A/cm2) is reduced by nearly two orders of magnitude compared with the pure MoS2 coating (5.54×10-6 A/cm2). Results indicate graphenes two-dimensional sheet structure has good self-lubricating properties and may effectively block the penetration of corrosive media when it is uniformly distributed in the coating. Therefore, the addition of graphene improves the tribological properties and corrosion resistance of MoS2-based composite coatings and the optimal amount of graphene is as 0.8%.