为改善齿轮表面摩擦学性能，本工作在20CrMnTi齿轮钢表面化学沉积具有良好润滑特性的FeS涂层。通过SEM、EDS、XRD、白光干涉仪、Raman光谱等手段对磨痕形貌和成分进行系统分析，考察了干摩擦条件下FeS涂层的摩擦学性能。结果表明，制备的FeS涂层纯度较好，涂层表面由大量微米片聚集而成，涂层厚度为5.4 μm左右。摩擦实验表明，相对齿轮钢基体，含FeS涂层试样的磨损程度较低、摩擦系数减小。随着载荷增加，FeS涂层的摩擦系数和磨损量呈降低趋势。随着转速增加，FeS涂层的摩擦系数变化不大但磨损量增加。微观分析表明，较高的载荷有利于润滑膜的铺展，而较高的转速会加重材料的氧化磨损和黏着磨损。在摩擦过程中，润滑膜向摩擦对偶件转移，在对偶件表面形成的转移膜能阻碍摩擦副微凸峰之间直接接触。涂层完全磨损后，转移膜仍能保持摩擦副间长效润滑性能，减少材料的磨损。

Gear transmission is a prevalent method in mechanical transmission; however, its effectiveness is often compromised by excessive wear on the meshing surfaces, primarily attributed to inadequate lubrication. This wear substantially hampers the overall service life of gears. In this study, a chemically deposited FeS coating, boasting favorable lubricating characteristics, was applied to 20CrMnTi gear steel to enhance the tribological performance of gear surfaces. The wear morphology and composition of the FeS coatings were analyzed using SEM, EDS, XRD, white light interferometry, and Raman spectroscopy. The tribological properties of the FeS coatings under dry friction conditions were examined. The FeS coating, with a thickness of about 5.4 μm, exhibited commendable purity, featuring an abundance of aggregated micron-sized sheets on its surface. Results revealed that the FeS-coated samples demonstrated reduced wear levels and friction coefficients compared with the gear steel substrate. Furthermore, the friction coefficient and wear volume of the FeS coating exhibited a noticeable decrease with increasing applied load. Although the friction coefficient of the FeS coating remained relatively stable with increasing rotational speed, wear volume increased. Microscopic analysis revealed that higher loads facilitated the spreading of the lubricating film, whereas elevated rotational speeds intensified oxidative and adhesive wear of the material. Throughout the experiment, the lubricating film transferred to the counterpart surface, forming a transfer film that impeded direct contact between the microasperities of the frictional pair. Even after the coating layer was fully worn, the transfer film can still maintain the long-lasting lubricating performance between the friction pairs and reduce the material wear.