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Effect of laser surface treatment on surface and bonding properties of carbon fiber reinforced composites

  • Lei Liu
  • Xiaodong Liu
  • Liang KongEmail author
  • Min Wang
  • Peiyuan Hu
  • Daming Wang
Original Research
  • 125 Downloads

Abstract

Carbon fiber reinforced plastics (CFRP) is widely used in the aerospace and automotive industries due to their light weight and high strength. The effective joining method of CFRP is bonding, and the surface state of CFRP is the main reason that affects the shear strength of the bonded joints. In order to improve the surface state of CFRP and shear strength, this paper systematically studied the effects of different power (80 W, 120 W, 180 W) laser treatment on the surface characteristics and bonding performance of CFRP and compared with the mechanical treatment (alcohol ultrasonic cleaned, sandpaper sanding). Four different adhesives were used in the adhesive joints, which were performed lap-shear tests. The SEM, XPS and contact angle measuring instrument were used to analyze the changes of physicochemical properties of CFRP after different surface treatment. The results showed that compared with alcohol cleaned and sandpaper sanding, 120 W laser treatment greatly improved the surface roughness of CFRP and formed micron-sized gaps. The water contact angle was reduced from 85° to 59.5°, and the surface energy increased from 25.6 mJ/m2 to 62.7 mJ/m2. The lap-shear results showed that the shear strength of the epoxy joints was improved after laser treatment, and the failure type was changed from interface failure to substrate failure. The polyurethane joint shear strength was not obviously improved and the combination failure of interface and cohesion was transformed into a pure interface failure after surface treatment.

Keywords

CFRP Laser treatment Surface characteristics Epoxy adhesive Polyurethane adhesive 

Notes

Acknowledgments

The authors would like to acknowledge the support received through Huayu Automotive Body Components Technology (Shanghai) Co., Ltd., and SAIC Motor Corporation Limited (SAIC Motor), and National Natural Science Foundation of China (51871154).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag France SAS, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Shanghai Key Laboratory of Material Laser Processing and ModificationShanghai Jiaotong UniversityShanghaiChina
  2. 2.Huayu Automotive Body Components Technology (Shanghai) Co., LTDShanghaiChina

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