Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan 430070, China; Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan 430070, China.
Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan 430070, China.
Ultrason Sonochem. 2022 Sep;89:106126. doi: 10.1016/j.ultsonch.2022.106126. Epub 2022 Aug 18.
Poor adhesion of nickel surface limits its further application in the aerospace field. In this study, plasma modification was conducted on the surface of the nickel plate pretreated by sandblasting, and then ultrasonic vibration was applied during the adhesively bonding process of the CFRP(Carbon fibre-reinforced polymer)/Ni joints. The bonding strength of the joints was increased by 65%. The adherend surface and the bonding interface were analyzed from microstructure, element distribution and chemical bonding to study the strengthening mechanism. By the sandblasting, irregular pits were formed on the nickel surface, effectively increasing the surface roughness. The plasma modification could introduce active functional groups including hydroxyl, amino and carbonyl on the nickel surface, which improved the surface wettability macroscopically. However, at a microscopic level, the adhesive with high viscosity and poor fluidity did not form a compact interface with the nickel. The ultrasonic application could promote the filling of the adhesive in irregular micro-scale pits on the surface, thereby strengthening the mechanical anchoring effect. Furthermore, the ultrasonic application produced dynamic impingement at the interface, enhancing the contact between the adhesive and the nickel plate. The adhesive molecules could fully collide and react with the active functional groups introduced on the nickel surface to form more chemical bonds, thus effectively improving the bonding strength of the CFRP/Ni joints.
镍表面的附着力差限制了其在航空航天领域的进一步应用。本研究对经过喷砂预处理的镍板表面进行等离子体改性，然后在碳纤维增强聚合物（CFRP）/Ni 接头的胶接过程中施加超声振动。接头的胶合强度提高了 65%。从微观结构、元素分布和化学结合等方面分析了被粘物表面和胶合界面，研究了强化机理。通过喷砂处理，在镍表面形成不规则的凹坑，有效地增加了表面粗糙度。等离子体改性可以在镍表面引入包括羟基、氨基和羰基在内的活性官能团，从而从宏观上提高表面润湿性。然而，在微观层面上，高粘度和低流动性的胶粘剂无法与镍形成紧密的界面。超声应用可以促进胶粘剂在表面不规则的微尺度凹坑中的填充，从而增强机械锚固效果。此外，超声应用在界面处产生动态冲击，增强了胶粘剂与镍板之间的接触。胶粘剂分子可以与镍表面引入的活性官能团充分碰撞和反应，形成更多的化学键，从而有效提高 CFRP/Ni 接头的胶合强度。
