Carbon fiber reinforced plastics (CFRP) is widely used in the aerospace and automotive industries due to their light weight and high strength. The effective joining method of CFRP is bonding, and the surface state of CFRP is the main reason that affects the shear strength of the bonded joints. In order to improve the surface state of CFRP and shear strength, this paper systematically studied the effects of different power (80 W, 120 W, 180 W) laser treatment on the surface characteristics and bonding performance of CFRP and compared with the mechanical treatment (alcohol ultrasonic cleaned, sandpaper sanding). Four different adhesives were used in the adhesive joints, which were performed lap-shear tests. The SEM, XPS and contact angle measuring instrument were used to analyze the changes of physicochemical properties of CFRP after different surface treatment. The results showed that compared with alcohol cleaned and sandpaper sanding, 120 W laser treatment greatly improved the surface roughness of CFRP and formed micron-sized gaps. The water contact angle was reduced from 85° to 59.5°, and the surface energy increased from 25.6 mJ/m² to 62.7 mJ/m². The lap-shear results showed that the shear strength of the epoxy joints was improved after laser treatment, and the failure type was changed from interface failure to substrate failure. The polyurethane joint shear strength was not obviously improved and the combination failure of interface and cohesion was transformed into a pure interface failure after surface treatment.

碳纤维增强塑料（CFRP）重量轻，强度高，因此广泛用于航空航天和汽车工业。CFRP的有效连接方法是粘结，而CFRP的表面状态是影响粘结接头剪切强度的主要原因。为了改善CFRP的表面状态和剪切强度，本文系统地研究了不同功率（80 W，120 W，180 W）激光处理对CFRP的表面特性和粘结性能的影响，并与机械处理进行了比较（酒精超声清洗，砂纸打磨）。粘合剂接头中使用了四种不同的粘合剂，并进行了搭接剪切测试。扫描电镜 用XPS和接触角测量仪分析了不同表面处理后CFRP的理化性质的变化。结果表明，与用酒精清洗和砂纸打磨相比，120 W激光处理大大改善了CFRP的表面粗糙度并形成了微米级的间隙。水接触角从85°减小到59.5°，表面能从25.6 mJ / m增加²至62.7mJ / m ²。搭接剪切结果表明，激光处理后环氧树脂接头的剪切强度得到了提高，并且破坏类型从界面破坏变为基底破坏。表面处理后，聚氨酯接缝的剪切强度没有明显提高，界面和内聚力的结合破坏转变为纯界面破坏。