The Effect of Aluminium Surface Treatments on the Bonding Properties of Silica-Modified Epoxy Adhesive Joints: A Statistical Approach

Francisco M. Dos  Santos; Lívia A. de  Oliveira; Alysson H. S.  Bueno; Rodrigo T. S.  Freire; Leandro José da  Silva; Gilberto García del  Pino; Tulio H.  Panzera

doi:10.6000/1929-5995.2021.10.3

Authors

Francisco M. Dos Santos Centre for Innovation and Technology in Composite Materials – CITeC, Department of Mechanical Engineering, Federal University of São João Del-Rei, Brazil
Lívia A. de Oliveira Centre for Innovation and Technology in Composite Materials – CITe C, Department of Mechanical Engineering, Federal University of São João Del-Rei, Brazil; Department of Natural Sciences, Federal University of São João Del-Rei, Brazil
Alysson H. S. Bueno Centre for Innovation and Technology in Composite Materials – CITe C, Department of Mechanical Engineering, Federal University of São João Del-Rei, Brazil; Department of Natural Sciences, Federal University of São João Del-Rei, Brazil
Rodrigo T. S. Freire Centre for Innovation and Technology in Composite Materials – CITe C, Department of Mechanical Engineering, Federal University of São João Del-Rei, Brazil; Department of Natural Sciences, Federal University of São João Del-Rei, Brazil
Leandro José da Silva Centre for Innovation and Technology in Composite Materials – CITe C, Department of Mechanical Engineering, Federal University of São João Del-Rei, Brazil; Department of Natural Sciences, Federal University of São João Del-Rei, Brazil
Gilberto García del Pino
Tulio H. Panzera Centre for Innovation and Technology in Composite Materials – CITe C, Department of Mechanical Engineering, Federal University of São João Del-Rei, Brazil

DOI:

https://doi.org/10.6000/1929-5995.2021.10.3

Keywords:

Aluminium surface treatment, silica microparticles, apparent shear strength, adherent strength, full factorial design (DoE).

Abstract

A full factorial design is carried out to investigate the effects of different surface treatments, the inclusion of silica microparticles and the use of wash primer on the apparent shear strength and adherent strength of single-lap aluminium joints. Scanning electron microscopy, surface energy and roughness measurements are performed to characterise the aluminium surface. The results show that the use of wash primer decreases the apparent shear strength of the joints significantly. The cohesive failure of the primer is the main cause of the reduction in strength. On the other hand, the inclusion of 10 wt.% of silica microparticles in the adhesive layers increases the shear strength by 26%. Surfaces treated with NaOH for one minute, without using a wash primer, result in the most resistant joint. In contrast to the apparent shear strength, adherent strength is most effective when only degreasing is considered.

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