Balkundhi Madhusudhan, Baloor Satish Shenoy, Bolar Gururaj
Department of Mechanical and Industrial Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, 576104, Karnataka, India.
Department of Aeronautical and Automobile Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, 576104, Karnataka, India.
Sci Rep. 2024 Dec 28;14(1):30909. doi: 10.1038/s41598-024-81777-1.
Metal and polymer interface bonding significantly influences the mechanical performance of fiber metal laminates (FMLs). Therefore, the effect of surface treatments (mechanical abrasion, nitric acid etching, P2 etching, sulfuric acid anodizing (SAA), and electric discharge machine (EDM) texturing) carried on aluminum 2024-T3 alloy sheets was evaluated considering surface morphology, surface topography, and surface roughness. Further, the influence of surface treatments on interfacial adhesion strength and failure mode between the aluminum alloy and carbon fiber prepreg was investigated. The surface treatments increased the surface roughness of the aluminum substrates. Surfaces treated using SAA, nitric acid, and P2 etchant showed improved wettability, while mechanically abraded and EDM textured substrates showcased hydrophobic behavior. The selected surface treatments significantly affected interfacial adhesion between the epoxy polymer and aluminum alloy. SAA and EDM texturing greatly enhanced the interfacial peel strength of FMLs. In the case of interfacial shear strength, EDM textured substrate showed superior performance, followed by SAA. Moreover, untreated and mechanically abraded specimens exhibited weaker bonding and adhesive failure at the aluminum-epoxy interface, whilst chemical treatments resulted in mixed model failure. EDM textured surface underwent cohesive failure, while a dominant mixed mode failure and fiber adhesion were observed in the SAA-treated specimen.
金属与聚合物界面结合对纤维金属层合板（FMLs）的力学性能有显著影响。因此，考虑表面形态、表面形貌和表面粗糙度，评估了对2024-T3铝合金板材进行的表面处理（机械研磨、硝酸蚀刻、P2蚀刻、硫酸阳极氧化（SAA）和电火花加工（EDM）纹理化）的效果。此外，还研究了表面处理对铝合金与碳纤维预浸料之间界面粘结强度和失效模式的影响。表面处理增加了铝基板的表面粗糙度。使用SAA、硝酸和P2蚀刻剂处理的表面显示出改善的润湿性，而机械研磨和EDM纹理化的基板表现出疏水行为。所选的表面处理显著影响了环氧树脂与铝合金之间的界面粘结。SAA和EDM纹理化极大地提高了FMLs的界面剥离强度。在界面剪切强度方面，EDM纹理化的基板表现出优异的性能，其次是SAA。此外，未处理和机械研磨的试样在铝-环氧界面处表现出较弱的粘结和粘结失效，而化学处理导致混合模式失效。EDM纹理化表面发生内聚失效，而在SAA处理的试样中观察到主要的混合模式失效和纤维粘附。
