Luo Juncheng, Liu Jianhua, Xia Huanxiong, Ao Xiaohui, Yin Haojie, Guo Lei
School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China.
Tangshan Research Institute, Beijing Institute of Technology, Tangshan 063015, China.
Materials (Basel). 2023 Aug 18;16(16):5674. doi: 10.3390/ma16165674.
Aluminum alloy adhesive bonding joint widely appears in many industrial products. Improving the mechanical performances of aluminum alloy bonding joints has been attracting much effort. To acquire more excellent bonding strength, this paper focused on the effects of different surface treatments, including laser ablation and milling superposed by phosphoric acid anodizing (PAA). The treated surfaces were characterized by roughness and contact angle, and the effects of the geometric parameters of microstructures on wettability, failure mode, and shear strength were examined. The results indicate that those surfaces where the spacing is smaller than the diameter present a hydrophilic property and the corresponding specimens are mainly subject to cohesive failure, and vice versa. Additionally, laser ablation with a properly designed dimple pattern can greatly improve the bonding strength, and the maximum average shear strength of specimens with a thickness of 50 μm reaches 32.82 MPa, which is an increase of 28.15% compared with the original milling specimen. Moreover, fabricating groove or grid patterns on the surfaces and applying PAA treatment can also significantly enhance the bonding strength, reaching up to 36.28 MPa.
铝合金粘接接头广泛应用于许多工业产品中。提高铝合金粘接接头的力学性能一直是研究的重点。为了获得更优异的粘接强度，本文重点研究了不同表面处理方法的效果，包括激光烧蚀以及磷酸阳极氧化（PAA）叠加铣削处理。通过粗糙度和接触角对处理后的表面进行表征，并研究微观结构的几何参数对润湿性、失效模式和剪切强度的影响。结果表明，间距小于直径的表面具有亲水性，相应的试样主要发生内聚破坏，反之亦然。此外，具有适当设计凹坑图案的激光烧蚀可以大大提高粘接强度，厚度为50μm的试样的最大平均剪切强度达到32.82MPa，与原始铣削试样相比提高了28.15%。此外，在表面制造沟槽或网格图案并进行PAA处理也可以显著提高粘接强度，最高可达36.28MPa。
