关键词: 碳纤维增强复合材料（CFRP）, 等离子体表面处理, 表面能, 胶接强度

Abstract:  To enhance the interfacial adhesion reliability of carbon fiber-reinforced polymer (CFRP), atmospheric plasma treatment was applied to modify the CFRP surface. The influence patterns of discharge power, nozzle distance and scanning speed on surface energy and bonding shear load were studied, and the decay characteristics of surface activity with storage time were analyzed. Results indicated that under optimized process parameters, the surface energy of CFRP increased from 38.7 mN/m to 64.0 mN/m, and the bonding shear load increased from 8.89 kN to 12.10 kN. Microstructural characterization results showed that after treatment, the surface morphology remained intact with no obvious damage, and the oxygen content increased significantly, indicating that polar oxygen-con鄄 taining groups were successfully introduced onto the surface, leading to enhanced interfacial chemical activity. Analysis of the time-dependent behavior of surface activity revealed that the modified surface properties re鄄 mained stable within 8 h after treatment, but surface wettability and bonding strength decreased noticeably after 12 h. The findings of this study provide a theoretical basis and technical support for the design and regulation of high-reliability bonding interfaces of CFRP.

Key words:  carbon fiber-reinforced polymer (CFRP), plasma surface treatment, surface energy, bonding strength