目的 研究载荷及摩擦频率对Al-Mg2Si复合涂层摩擦磨损性能的影响。方法 用高速往复摩擦磨损测试仪考察了不同载荷及摩擦频率下的Al-Mg2Si复合涂层的摩擦系数，并用SEM和超景深三维显微镜检测分析磨痕的表面形貌、磨痕深度和体积，对比分析载荷及摩擦频率的影响。结果 载荷一定时，随着摩擦频率的增大，摩擦系数呈下降趋势，体积磨损率呈上升趋势。频率为3 Hz时，摩擦系数最小，为0.50；体积磨损率最大，为166.08×10?4 mm3/(N?mm)。频率从1 Hz增至3 Hz时，摩擦系数减少了0.65，体积磨损率增加了3.1倍。频率一定时，随着载荷的增加，摩擦系数和体积磨损率均呈增加趋势。载荷为15 N时，摩擦系数和体积磨损率最大，分别为0.93和126.27×10?4 mm3/(N?mm)。载荷从5 N增至15 N时，摩擦系数增加了0.27，体积磨损率增加了0.4倍。结论 与载荷相比，摩擦频率对Al-Mg2Si复合涂层摩擦性能的影响更大。

The work aims to study effects of load and friction frequency on friction and wear properties of Al-Mg2Si composite coating. Friction coefficient of Al-Mg2Si composite coating under different load and friction frequency was investigated with high-speed reciprocating friction and wear tester. Surface morphology, depth and volume of grinding crack were analyzed with SEM and ultra-depth three-dimensional microscope. The effects of load and friction frequency were comparatively analyzed. Under a constant load, as friction frequency increased, friction coefficient tended to decrease while volume wear rate tended to increase. At the frequency of 3 Hz, the friction coefficient was the minimum (0.50), and the volume wear rate was the maximum (166.08×10-4 mm3/(N?mm)). As the frequency increased from 1 Hz to 3 Hz, the friction coefficient decreased by 0.65, and the abrasion wear rate increased by 3.1 times. At a constant frequency, both the friction coefficient and volume wear rate tended to increase as the load increased. Under the load of 15 N, both friction coefficient and volume wear rate were the maximum (0.93, 126.27×10-4 mm3/(N?mm), respectively). As the load increased from 5 N to 15 N, the friction coefficient increased by 0.27, and the volume wear rate by 0.4 times. Compared with load, friction frequency has greater effect on friction properties of Al-Mg2Si composite coating.