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Hybrid Sol–Gel Silica Coatings Containing Graphene Nanosheets for Improving the Corrosion Protection of AA2024-T3

AuthorsAfsharimani, Nasima; Durán, Alicia ; Galusek, Dušan; Castro Martín, Yolanda
KeywordsAluminium alloy
Sol–gel coatings
Corrosion protection
SiO2 nanoparticles
Graphene nanosheets
Issue Date29-May-2020
PublisherMultidisciplinary Digital Publishing Institute
CitationNanomaterials 10(6): 1050 (2020)
AbstractIn the present work, nanostructured graphene nanosheets were added to hybrid silica sols and deposited on aluminium alloy A2024-T3 to study the effect on the corrosion behaviour. Sols were prepared using tetraethyl-orthosilicate (TEOS), 3-glycidoxypropyl-trimethoxysilane (GPTMS) and a colloidal silica suspension (LUDOX) as silica precursors with adding chemically modified graphene nanosheets (GN-chem). The graphene nanosheets were modified through a straightforward and simple hydrothermal approach and then, dispersed into a silica sol (SiO2/GN-chem). ATR-FTIR was used to optimize the silica sol–gel synthesis and to confirm the cross-linking of the silica network. The corrosion behaviour of the SiO2/GN-chem coatings was also analysed by electrochemical measurement (potentiodynamic polarization) in 0.05 M NaCl solution. The results showed that the incorporation of modified graphene nanosheets into hybrid silica sol–gel coatings affected the corrosion properties of the substrates. An improvement in the corrosion resistance was observed likely due to the enhanced barrier property and hydrophobic behaviour obtained by incorporation of GN-chem and colloidal silica nanoparticles.
Description© 2020 by the authors.
Publisher version (URL)https://doi.org/10.3390/nano10061050
Appears in Collections:(ICV) Artículos
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