Durability of Metal-Composite Friction Spot Joints under Environmental Conditions

Seyed M. Goushegir, Nico Scharnagl, Jorge F. dos Santos, S. T. Amancio-Filho*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The current paper investigates the durability of the single-lap shear aluminum-composite friction spot joints and their behavior under harsh accelerated aging as well as natural weathering conditions. Four aluminum surface pre-treatments were selected to be performed on the joints based on previous investigations; these were sandblasting (SB), conversion coating (CC), phosphoric acid anodizing (PAA), and PAA with a subsequent application of primer (PAA-P). Most of the pre-treated specimens retained approximately 90% of their initial as-joined strength after accelerated aging experiments. In the case of the PAA pre-treatment, the joint showed a lower retained strength of about 60%. This was explained based on the penetration of humidity into the fine pores of the PAApre-treated aluminum, reducing the adhesion between the aluminum and composite. Moreover, friction spot joints produced with three selected surface pre-treatments were held under outside natural weathering conditions for one year. PAA-P surface pre-treated specimens demonstrated the best performance with a retained strength of more than 80% after one year. It is believed that tight adhesion and chemical bonding reduced the penetration of humidity at the interface between the joining parts.

Original languageEnglish
Article number1144
Number of pages20
Issue number5
Publication statusPublished - 4 Mar 2020


  • Friction spot joining
  • fiber reinforced composites
  • aluminum alloys
  • aging
  • outdoor environmental durability
  • mechanical properties
  • Aging
  • Fiber reinforced composites
  • Mechanical properties
  • Aluminum alloys
  • Outdoor environmental durability

ASJC Scopus subject areas

  • Materials Science(all)

Fields of Expertise

  • Advanced Materials Science

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