ELECTROCHEMICAL STUDIES ON MODIFIED ORGANO-SILANES COMPOSITE COATINGS FOR ALUMINIUM CORROSION INHIBITION

Ioana  MAIOR; Ioana-Alina  CIOBOTARU; Simona  CĂPRĂRESCU; Anca  COJOCARU; Dănuţ-Ionel  VĂIREANU

Authors

Ioana MAIOR Department of Inorganic Chemistry, Physical Chemistry and Electrochemistry, Faculty of Applied Chemistry and Materials Science, Polytechnica University of Bucharest, Romania. Email: ioana.maior@upb.ro. https://orcid.org/0000-0002-8195-1013
Ioana-Alina CIOBOTARU Department of Inorganic Chemistry, Physical Chemistry and Electrochemistry, Faculty of Applied Chemistry and Materials Science, Polytechnica University of Bucharest, Romania. Email: ioanaalinaciobotaru@yahoo.com. https://orcid.org/0000-0002-8159-0350
Simona CĂPRĂRESCU Department of Inorganic Chemistry, Physical Chemistry and Electrochemistry, Faculty of Applied Chemistry and Materials Science, Polytechnica University of Bucharest, Romania. Email: simona.caprarescu@upb.ro. https://orcid.org/0000-0002-0267-0855
Anca COJOCARU Department of Inorganic Chemistry, Physical Chemistry and Electrochemistry, Faculty of Applied Chemistry and Materials Science, Polytechnica University of Bucharest, Romania. Email: anca.cojocaru@upb.ro. https://orcid.org/0000-0001-9109-488X
Dănuţ-Ionel VĂIREANU Department of Inorganic Chemistry, Physical Chemistry and Electrochemistry, Faculty of Applied Chemistry and Materials Science, Polytechnica University of Bucharest, Romania. Email: danut.vaireanu@upb.ro. https://orcid.org/0000-0003-2737-2990

Keywords:

corrosion, aluminium, phosphoric acid, silanes, nanoparticles, electrochemical impedance spectroscopy, FT-IR, SEM

Abstract

The main objective of this study consists in developing a new anticorrosive protection coating for packaging industry based on deposition of organo-silanes composite film on the metallic material surface. Silane solutions (octyltrietoxysilane OTES and vyniltrietoxysilane VTES) modified with SiC and CeO₂ nanoparticles were applied on a 99.99% aluminium substrate and compared with a sample of aluminium commercially available package (can). For the analysis of film composition and metal surface Fourier Transform Infrared Spectroscopy (FT-IR) and Scanning Electron Microscopy (SEM) were performed. The results highlighted the film’s compactness and its adhesive properties, as well as the favourable effect of nanoparticles in tested coatings. Corrosion tests on aluminium samples with and without protective coatings, as well as on commercially available aluminium cans were carried out in phosphoric acid 3M using open circuit potential, potentiodynamic curves and Electrochemical Impedance Spectroscopy (EIS) techniques.

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