Strong adhesive bonding between carbon fibre reinforced polymer (CFRP) and aluminium (Al) alloy substrates is essential for structural integrity of modern aircrafts. This study reports a simple and effective method to increase the adhesion interface strength between CFRP and Al alloy substrates by means of a combined sandblasting and resin pre-coating (RPC) process. The RPC technique is used to maximize the full potential of surface abrasion from sandblasting by sealing all micro-cavities and wetting the entire surface and sub-surface openings over the Al substrate and CFRP. The RPC solution consisting of around 90 wt% of acetone and 10 wt% of resin (without hardener) takes resin into the surface micro-openings and effectively increases the wettability of bond surfaces. Based on single lap shear tests, over 170.2% of improvement in the shear strength has been achieved by the combined sandblasting and RPC method in compared with the adhesive joints without any surface treatment. The surface roughness, contact angle measurements and Scanning Electron Microscope (SEM) observations are conducted to investigate the wettability and microstructural details, confirming the effectiveness of the RPC technique.

碳纤维增强聚合物 (CFRP) 和铝 (Al) 合金基材之间的强力粘合对于现代飞机的结构完整性至关重要。本研究报告了一种简单有效的方法，通过喷砂和树脂预涂层 (RPC) 相结合的工艺来提高 CFRP 和铝合金基材之间的粘合界面强度。RPC 技术用于通过密封所有微腔并润湿铝基板和 CFRP 上的整个表面和亚表面开口，最大限度地发挥喷砂表面磨损的全部潜力。由约 90 wt% 的丙酮和 10 wt% 的树脂（不含硬化剂）组成的 RPC 溶液将树脂带入表面微孔中，并有效地增加了粘合表面的润湿性。基于单搭接剪切测试，超过 170。与未经任何表面处理的粘合接头相比，喷砂和RPC结合方法的剪切强度提高了2%。进行表面粗糙度、接触角测量和扫描电子显微镜 (SEM) 观察以研究润湿性和微观结构细节，确认 RPC 技术的有效性。