目的 研究氮含量对CrCN镀层结构和摩擦学性能的影响。方法 采用微弧离子镀技术制备CrCN镀层，通过改变氮气的流量来改变镀层中氮元素含量。利用扫描电子显微镜（SEM）和原子力显微镜（AFM）观察镀层的截面和表面形貌，采用划痕法对镀层与基体的结合强度进行评价，采用维氏硬度计测试镀层的显微硬度，利用针盘式摩擦磨损试验机测定镀层的摩擦系数。结果 当通入的氮气流量逐渐增大时，镀层由致密细小的颗粒逐步演变为含微孔的柱状组织。当氮气流量为3 mL/min时，镀层中生成的弥散分布的硬质相具有显著的强韧化作用，镀层的膜基结合力和硬度分别达到最大值41 N和1476HV，摩擦系数略微增大。继续增大氮气流量后，镀层性能有所下降。结论 通过控制氮气流量来控制镀层中氮元素的含量，可以显著优化镀层结构和性能，达到结合强度、硬度和摩擦系数的最优化配置。

The work aims to explore effects of N content on microstructures and tribological properties of CrCN coatings. The CrCN coatings were prepared by adopting micro-arc ion plating technology. The N content of the coatings was changed by regulating flow amount of nitrogen gas. Cross section and surface morphology of the coatings were evaluated with SEM and AFM. Bonding strength between the coatings and substrate was determined in scratch method. Microhardness of the coatings was characterized with Vickers hardness tester. Friction coefficient of the coatings was measured with pin-on-disc friction and wear tester. As the nitrogen flow increased gradually, microstructure of the coatings evolved from dense and small grains to a larger columnar structure with porous grains. When the nitrogen flow was 3 mL/min, dispersed hard phases in the coatings had obvious strengthening effect, the bonding strength increased to 41 N and hardness to 1476HV, while the friction coefficient increased slightly. Properties of the coatings degraded as the nitrogen flow further increased. The structure and properties of CrCN coatings can be greatly optimized, and an optimal combination of bonding strength, hardness and friction coefficient can be achieved by controlling N content in the coatings based upon nitrogen flow regulation.