Improving Adhesive Bonding of Al Alloy by Laser-Induced Micro–Nano Structures

Guang Li,Mingwei Lei,Benhai Li,Kai Li,Chen Liang,Zhipeng Wei,Junlong Wang,Xiaohua Wang

doi:10.3390/app12031199

Guang Li, Mingwei Lei + Show 6 more

Open Access

https://doi.org/10.3390/app12031199

Copy DOI

Abstract

In this paper, laser surface treatment of Al alloy was studied by comparison of sandblasting and laser ablation. The effects of laser spot distribution on surface roughness, contact angle, chemical composition and shear strength of Al alloy were analyzed. The experimental results showed that the bonding performance of Al alloy are promoted by controlling the laser spot spacing. When laser spot spacing was smaller than the size of the laser spot, micro–nano composite structures were induced by multiple laser pulses, which would improve shear strength by increasing the contact area between Al alloy and adhesive. Using laser surface treatment, the adhesion properties on Al alloy can be promoted.

Highlights

Aluminum (Al) alloy is popularly applied in the fields of aviation, aerospace and vehicles, owing to its high strength, light weight and good corrosion resistance [1]
Al alloy is used as the material for adhesively bonded joints, its surface pretreatment is one of the most important processes before adhesive bonding [2]
It can be concluded that surface roughness, contact angle and shear strength of Al alloy was controllable by laser surface treatment

Summary

Introduction

Aluminum (Al) alloy is popularly applied in the fields of aviation, aerospace and vehicles, owing to its high strength, light weight and good corrosion resistance [1]. The surface of Al alloy is treated by sandblasting to increasing the shear strength. To enhance the adhesion on Al alloy, the surface pretreatment methods including chemical etching, electroplating and sandblasting have been developed in recent years [3,4,5,6,7,8,9,10,11,12,13,14,15,16]. As demonstrated by Zhou J. et al, the shear strength of Al alloy after chemical etching was as high as 20.4 MPa [13]. Wang X.’s group showed the shear strength pretreated with different chemical reagents was 20% higher [14].

Methods

Results

Conclusion