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Nanocomposite coatings based on graphene and organosilicized polymer deposited by atmospheric pressure plasma: Application to carbon steel corrosion protection

Abstract : In this thesis, graphene-based nanocomposite thin films were developed for the first time by non-equilibrium atmospheric plasma to improve the corrosion resistance properties of E24 carbon steel and 2024 aluminum. A specific strategy was proposed and consists in atomizing a polymerizable colloidal suspension via a nebulizer into the discharge zone to obtain nanocomposite layers in a single step. Two types of plasma discharge have been studied, a dielectric barrier discharge (DBD) and a plasma jet (APPJ), for the growth of nanocomposite layers with an organosilicon matrix from a colloidal solution obtained by dispersing graphene nanosheets in a hexamethyldisiloxane solution (HMDSO). The coatings were characterized by SEM, FTIR, XPS and Raman as a function of the plasma discharge parameters such as power, plasma gas and monomer flow rates and treatment time. The analyses show a homogeneous dispersion of the graphene sheets in the polymer matrix, and the coatings obtained by DBD are less porous and have a more organic character than those obtained by APPJ. The anti-corrosion properties of the nanocomposites were evaluated by electrochemical impedance spectroscopy and show an improvement of the corrosion protection effect, with an increase under optimal conditions of up to 3 orders of magnitude in the resistance to charge transfer on treated steel. The results obtained in this thesis demonstrate that the incorporation of graphene nanosheets in the plasma polymer matrix has the effect of reducing the porosity of the layers, increasing the corrosion resistance, and also improving the hardness and elastic modulus of the nanocomposites which are important points for industrial applications.
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Submitted on : Wednesday, November 4, 2020 - 2:25:29 PM
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Abdessadk Anagri. Nanocomposite coatings based on graphene and organosilicized polymer deposited by atmospheric pressure plasma: Application to carbon steel corrosion protection. Analytical chemistry. Sorbonne Université, 2020. English. ⟨tel-02988070⟩

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