Study of the Efficiency of Ag-SiO₂ Nanoparticles as Additives in Anticorrosion Coatings

Abstract:

In this work, Ag-SiO₂ nanoparticles were used as additives in an epoxy paint to evaluate their efficiency to protect SAE 1020 carbon steel from corrosion. Ag-SiO₂ particles were characterized using X-ray diffraction (XRD), dynamic light scattering (DLS) and transmission electron microscopy (TEM). Samples of ABNT 1020 steel were coated with an industrial epoxy based paint added with Ag-SiO₂ nanoparticles. Electrochemical tests of open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) were conducted to evaluate the anticorrosive behavior of the investigated coatings when exposed to saline solution. DLS data show that Ag-SiO₂ particles have average diameters of around 223.4 nm. TEM images highlight the presence of Ag-SiO₂ particles agglomeration. EIS and OCP measurements show that addition of 0.5% w/w Ag-SiO₂ to the epoxy paint could improve the efficiency of the anticorrosive coating, when compared to the epoxy paint without any corrosion inhibitor. Results also show the importance of developing efficient dispersion techniques to avoid the agglomeration of the particles that may increase the porosity of the coating and thus affect its corrosion protection efficiency.

• Periodical: Materials Science Forum (Volume 869)
• Pages: 663-668
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.869.663
• Online since: August 2016
• Authors: Rômulo de O. Pletsch*, Kleber G.B. Alves, Magda R.S. Vieira, Celso P. de Melo, Nadège S. Bouchonneau
• Keywords: Ag-SiO₂, Corrosion, Electrochemical Tests, Organic Coatings

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