Effects of anodizing surface treatment on the mechanical strength of aluminum alloy 5083 to fibre reinforced composites adhesive joints

Abstract

In this study, the anodizing process based on the use of tartaric sulfuric acid solution (TSA) was carried out on metal substrate to evaluate for the first time its effect on the adhesion strength and corrosion resistance of aluminium alloy (i.e., AA5083) to fibre (i.e., basalt or glass) reinforced composite adhesive joints for nautical applications. Furthermore, some TSA anodized samples were soaked in a NaOH solution to investigate the influence of this post-immersion step on the joint performances. With the aim to improve the fibre-matrix adhesion in the composite substrate thus further increasing the overall mechanical response of the joint, glass and basalt fibres were treated with a silane coupling agent solution. The corrosion behaviour of the aluminium alloy was studied by electrochemical techniques. Samples morphology was analysed by scanning electron microscopy, while the interaction between aluminium alloy substrate and epoxy resin was studied through contact angle analysis and resin uptake tests. The effectiveness of the silane treatment was examined by means of Fourier transform infrared spectroscopy and quasi-static tensile tests carried out on dry glass and basalt fabrics. The mechanical response of the resulting joints was evaluated by means of quasistatic tensile tests in accordance to ASTM D3528 standard.

Effect of the Anodizing Temperature on Microstructure and Tribological Properties of 6061 Aluminum Alloy Anodic Oxide Films

“…The low density, high specific strength, excellent thermal conductivity, and corrosion resistance of aluminum and its alloys (Al-Cu, Al-Mg, Al-Mg-Si and Al-Zn) are promoting the development of aerospace, construction, automobile, shipbuilding, controllable fusion technology and chemical industries [1][2][3][4]. The Mg and Si elements in 6061 aluminum alloy (Al-Mg-Si) improve the plasticity, weldability, and processability of the material, making the 6061 aluminum alloy widely used in electrical fixtures and electronic precision instruments, aerospace, and automotive structural parts [5][6][7]. Although aluminum alloys are prone to form an oxide layer in the atmospheric environment, the primary oxide layer is only a non-uniform structure of tens to hundreds of angstroms, resulting in low hardness and poor wear resistance of 6061 aluminum alloy [8][9][10][11].…”

Characterization of Anodizing Process on Aluminum Series 6 with Variable Voltage

“…Tests carried out include the microstructure and the thickness of the oxide layer. The test results show that the addition of strong currents in the anodizing process affects the thickness of the oxide layer [16,17]. The oxide layer thickness, surface hardness, and wear resistance of 6061 aluminum are quality characteristics.…”

Atmospheric plasma treatment effect on shear strength of GFRP-Aluminum adhesively bonded lap joints

“…Mechanical fastening, one of the traditional techniques, is used to mechanically join two or more parts [10]. In this technique, a third component, such as a bolt or rivet, is used to join the different parts [11]. One of the traditional methods is mechanical fastening, where two or more parts are joined mechanically using a third component like a bolt or rivet.…”