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MgAl-LDH/graphene protective film: Insight into LDH-graphene interaction
Department of Industrial Engineering, University of Trento, TN, Italy.
Department of Industrial Engineering, University of Trento, TN, Italy.
Department of Mechanical and Aerospace Engineering, Air University Islamabad, Pakistan.
Department of Physics, University of Trento, TN, Italy.
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2020 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 401, article id 126253Article in journal (Refereed) Published
Abstract [en]

MgAl-layered double hydroxides (LDHs) thin films, exhibiting two distinct surface morphologies (Platelet and Cauliflower-like), were synthesized directly on the aluminum substrate. The as-prepared films were further modified with graphene due to the chemical inertness of graphene and its capability to act as a possible physical barrier against ionic media. The morphology and structure of MgAl-LDH/graphene composite films are fully characterized. The corrosion resistance properties were analyzed through Electrochemical impedance spectroscopy and the results were further fitted using “ZSimpWin” software to evaluate coating behavior. The graphene was found to interact with the LDH structure and provide another pathway for the corrosion reactions and results in improve LDHs corrosion resistance properties. The sealing effect of graphene resists the aggressive media penetration and caused an increase of one order magnitude in impedance modulus of MgAl-LDHs. The enhancement in corrosion resistance properties is attributed to the graphene impermeable behavior against corrosive species confirmed by physical and electrochemical characterizations.

Place, publisher, year, edition, pages
Elsevier, 2020. Vol. 401, article id 126253
Keywords [en]
MgAl-LDH, Graphene, Raman, FIB-SEM, Thin films, EIS
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:hj:diva-50600DOI: 10.1016/j.surfcoat.2020.126253ISI: 000583161500021Scopus ID: 2-s2.0-85090563023Local ID: PP JTH 2020 embargo 24;JTHMaterialISOAI: oai:DiVA.org:hj-50600DiVA, id: diva2:1466763
Available from: 2020-09-14 Created: 2020-09-14 Last updated: 2020-12-15Bibliographically approved

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Zanella, Caterina

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