Electrochemical investigation of galvanic corrosion between aluminum 7075 and glass fiber/epoxy composites modified with carbon nanotubes |
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| Authors: | Robert Ireland Luciana Arronche Valeria La Saponara |
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| Affiliation: | 1. School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, P.O. Box, 11155-4563, Tehran, Iran;2. Department of Surface Coatings and Corrosion, Institute for Color Science and Technology, P.O. Box, 16765-654, Tehran, Iran;1. Department of Mechanical Engineering, Curtin University, Bentley, WA, Australia;2. Adelaide Microscopy, the University of Adelaide, Adelaide, SA, Australia;3. Department of Civil Engineering, Curtin University, Bentley, WA, Australia;4. School of Engineering, University of South Australia, Mawson Lakes, SA 5095, Australia;5. Faculty of Design and Creative Technologies, Auckland University of Technology, Auckland, New Zealand;6. Department of Mechanical Engineering, Indian School of Mines, Dhanbad 826004, Jharkhand, India;1. School of Materials Science and Engineering, Beihang University, Beijing 100191, China;2. School of Energy and Power Engineering, Inner Mongolia University of Technology, Huhhot 010051, China;1. Department of Applied Sciences, University du Québec à Chicoutimi (UQAC), 555 boul. Université Est, Saguenay, Québec, Canada, G7H 2B1;2. National Research Council Canada (NRC), Saguenay Site, 501 boul. Université Est, Saguenay, Québec, Canada, G7H 8C3;1. Milliken Pipe Wrap, Houston, TX 77060, USA;2. Department of Chemical & Biomolecular Engineering, University of Houston, Houston, TX 77204, USA;3. Texas Center for Superconductivity, University of Houston, TX 77204, USA;4. DCD Consulting, LLC, League City, TX 77573, USA;1. Department of Materials Science, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan;2. Kanagawa Institute of Industrial Science and Technology (KISTEC), 3-2-1 Sakado, Takatsu-ku, Kawasaki, Kanagawa, Tokyo 213-0012, Japan;3. Department of Applied Mechanics and Aerospace Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan;4. Kagami Memorial Research Institute for Materials Science and Technology, Waseda University, 2-8-26 Nishiwaseda, Shinjuku-ku, Tokyo 169-0051, Japan |
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| Abstract: | We investigate whether the presence of carbon nanotubes in previously non-conductive composites may cause galvanic corrosion. We focus on aluminum 7075 alloy and glass fiber-reinforced polymers (GFRP), where the epoxy resin is modified with multi-walled carbon nanotubes (MWCNTs). Whole aluminum bars were bonded with MWCNT/GFRP in a co-cure, or were connected electrically with the composite through a galvanic cell.The investigation includes characterization of the treated and baseline epoxy resin, high humidity tests at room temperature, full immersion tests in an aggressive environment, and standard galvanic coupling tests in an aggressive environment.Results show that coupling MWCNT/GFRP samples with aluminum 7075 causes approximately doubled corrosion rate and mass loss rate compared to baseline GFRP samples. We envision that this work will impact the research community and indicate the need of careful coupling selection and careful surface treatment between nanomaterials and conventional materials, since the ability to monitor damage in situ is very desirable. |
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