This study investigates the influence of the laser ablation regimes and the material removal mechanisms on the morphologies, topographies, and chemistries of laser formed surface structures on the aluminum alloy EN-AW 6082. The characteristics of these surface structures are correlated to the adhesion and durability of joints bonded adhesively with PA6. X-ray photoelectron spectroscopy showed that the chosen laser ablation regimes have almost no influence on surface chemistries while microscopic analysis indicated that the surface structures are affected significantly. The adhesion properties and durability of the adhesively bonded joints studied by single lap shear and aging tests are strongly affected by the ablation regimes. Optimal initial shear strengths and aging resistances were obtained for a single step laser treatment with parameters corresponding to the melt displacement mode, while multi-step treatments provided no further benefits. A failure analysis revealed that the micro- and nanostructures developed in melt ejection regime of laser ablation can act as weak boundary layers (WBLs) on metal substrates and affect adversely the adhesion and durability of the joints.

本研究调查了激光烧蚀方案和材料去除机制对铝合金 EN-AW 6082 上激光形成的表面结构的形态、形貌和化学成分的影响。这些表面结构的特性与附着力和耐久性相关与 PA6 粘合的接头。X 射线光电子能谱表明，所选择的激光烧蚀方案对表面化学性质几乎没有影响，而微观分析表明表面结构受到了显着影响。通过单圈剪切和老化试验研究的粘合接头的粘合性能和耐久性受到烧蚀方案的强烈影响。使用与熔体置换模式相对应的参数的单步激光处理获得了最佳的初始剪切强度和抗老化性，而多步处理没有提供进一步的好处。失效分析表明，在激光烧蚀的熔体喷射状态中形成的微米和纳米结构可以作为金属基材上的弱边界层 (WBL)，并对接头的粘附性和耐久性产生不利影响。