Assessment of Residual Performances of Al–CFRP Cocured Hybrid Samples Subjected to Galvanic Corrosion
Publication: Journal of Aerospace Engineering
Volume 32, Issue 5
Abstract
Tartaric sulfuric anodizing (TSA) and -glycidoxypropyltrimethoxysilane silanization (-GPS) were tested as treatments of Al-2024 and Al-2198 aluminum (Al) alloys for promoting adherence and corrosion protection of the Al–carbon fiber-reinforced plastics (Al–CFRPs) interface in Al–CFRP cocured hybrid materials, and compared with chromic acid anodizing (CAA). The corrosion resistance and the durability of the Al–CFRP interface were investigated and discussed. Polarization curves and Evans diagrams were achieved in NaCl solution, and the adhesion and durability of the interface were evaluated by mechanical tensile test on single-lap joint specimens before and after salt-spray exposure. The results are discussed and compared with CAA to evaluate the proposed treatments as CAA substitution candidate in the REACH European regulation (Registration, Evaluation, Authorization and Restriction of Chemicals). It was found that TSA and -GPS can provide as good adhesion as CAA before salt-spray exposure, but a higher mechanical strength depletion of the interface is obtained after long-term salt-spray exposure compared with CAA. This depletion was attributed to an insufficient long-term corrosion resistance of TSA or -GPS compared with CAA.
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Published In
Journal of Aerospace Engineering
Volume 32 • Issue 5 • September 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Aug 30, 2018
Accepted: Jan 24, 2019
Published online: May 24, 2019
Published in print: Sep 1, 2019
Discussion open until: Oct 24, 2019
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