Abstract In this study, the combinative effects of surface treatments and the reinforcement of graphene nanoplatelets (GNPs) on the adhesive joint of aluminium alloy were investigated. Aluminium alloy plates were treated with acetone cleaning, grit blasting, chemical etching, and phosphoric acid anodisation (PAA) under various conditions. The effects of hydrothermal sealing of the anodised aluminium were also studied. Surface energies of the treated aluminium plates were determined using contact angle measurements. The samples were then bonded with epoxy or GNPs reinforced epoxy adhesives. The bonding strength of the aluminium joints was measured by single lap shear tests. The joint strength was significantly affected by both surface treatment and the reinforcement of GNPs. For grit blasted and PAA samples with hydrothermal sealing, the joint strength increased by 64% and 57% respectively due to the addition of 0.42 wt% of GNPs. Across all surface treatments, the highest average shear strength (17.6 MPa) was achieved for PAA samples with hydrothermal sealing and the addition of GNPs followed by PAA samples with no sealing and pure epoxy (17.0 MPa). Fractal surface images were analysed, and the correlation between epoxy infiltration behaviour, surface treatments and nano-reinforcement was critically discussed.

中文翻译：

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表面改性和石墨烯纳米片增强对铝合金粘接接头的影响

摘要 在这项研究中，研究了表面处理和石墨烯纳米片（GNPs）的增强对铝合金粘合接头的组合影响。铝合金板在各种条件下经过丙酮清洗、喷砂、化学蚀刻和磷酸阳极氧化 (PAA) 处理。还研究了阳极氧化铝的水热密封效果。处理过的铝板的表面能使用接触角测量来确定。然后将样品与环氧树脂或 GNP 增强环氧树脂粘合剂粘合。通过单搭接剪切试验测量铝接头的结合强度。接头强度受表面处理和 GNP 增强的显着影响。对于喷砂和水热密封的 PAA 样品，由于添加了 0.42 wt% 的 GNP，接头强度分别增加了 64% 和 57%。在所有表面处理中，具有水热密封和添加 GNP 的 PAA 样品的平均剪切强度最高 (17.6 MPa)，其次是无密封和纯环氧树脂 (17.0 MPa) 的 PAA 样品。分析了分形表面图像，并批判性地讨论了环氧树脂渗透行为、表面处理和纳米增强之间的相关性。