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Article

Durability of Metal-Composite Friction Spot Joints under Environmental Conditions

1
Solid State Joining Processes, Materials Mechanics, Institute of Materials Research, Centre for Materials and Coastal Research, Helmholtz-Zentrum Geesthacht, 21502 Geesthacht, Germany
2
Corrosion and Surface Technology, Magnesium Innovation Center (MagIC), Materials Mechanics, Institute of Materials Research, Centre for Materials and Coastal Research, Helmholtz-Zentrum Geesthacht, 21502 Geesthacht, Germany
3
BMVIT Endowed Professorship for Aviation, Institute of Materials Science, Joining and Forming, Graz University of Technology, 8010 Graz, Austria
*
Author to whom correspondence should be addressed.
Materials 2020, 13(5), 1144; https://doi.org/10.3390/ma13051144
Received: 2 December 2019 / Revised: 26 February 2020 / Accepted: 28 February 2020 / Published: 4 March 2020
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 PAA pre-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. View Full-Text
Keywords: friction spot joining; fiber reinforced composites; aluminum alloys; aging; outdoor environmental durability; mechanical properties friction spot joining; fiber reinforced composites; aluminum alloys; aging; outdoor environmental durability; mechanical properties
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MDPI and ACS Style

Goushegir, S.M.; Scharnagl, N.; dos Santos, J.F.; Amancio-Filho, S.T. Durability of Metal-Composite Friction Spot Joints under Environmental Conditions. Materials 2020, 13, 1144. https://doi.org/10.3390/ma13051144

AMA Style

Goushegir SM, Scharnagl N, dos Santos JF, Amancio-Filho ST. Durability of Metal-Composite Friction Spot Joints under Environmental Conditions. Materials. 2020; 13(5):1144. https://doi.org/10.3390/ma13051144

Chicago/Turabian Style

Goushegir, Seyed M., Nico Scharnagl, Jorge F. dos Santos, and Sergio T. Amancio-Filho. 2020. "Durability of Metal-Composite Friction Spot Joints under Environmental Conditions" Materials 13, no. 5: 1144. https://doi.org/10.3390/ma13051144

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