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Adhesively bonded CFRP/Al joints: Influence of the surface pretreatment on corrosion during salt spray test
Author(s) -
Schanz Jochen,
Nester Sara,
Meinhard Dieter,
Pott Timo,
Riegel Harald,
De Silva Anjali K. M.,
Harrison David K.,
Knoblauch Volker
Publication year - 2022
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.202112752
Subject(s) - materials science , composite material , corrosion , crevice corrosion , surface roughness , galvanic cell , galvanic corrosion , optical microscope , surface finish , carbon steel , metallurgy , scanning electron microscope
The objective of this study was to investigate the influence of different surface pretreatments on the aging behavior of adhesively bonded carbon fiber reinforced polymers/Al joints in a standardized salt spray environment. Therefore, the bonding surfaces were acetone‐cleaned or laser‐pretreated by near‐infrared laser radiation. The pretreated surfaces were examined using optical microscopes, roughness measurements, and infiltration tests. Mechanical testing of the joints was performed in the unaged state and after five aging durations from 120 to 1440 h. The acetone‐cleaned specimens lose a maximum 20% of their initial average shear strength of 22 MPa after aging up to 1440 h. In contrast, the fracture patterns of the laser‐pretreated samples show corrosive degradation after 720 h, indicating galvanic coupling and crevice corrosion. This leads to a significant decrease in shear strength up to 50% after 1440 h of aging. Therefore, some strategies to avoid contact corrosion via the pretreatment and joining process are presented additionally.