Table of Contents Author Guidelines Submit a Manuscript
International Journal of Corrosion
Volume 2017 (2017), Article ID 1541267, 9 pages
https://doi.org/10.1155/2017/1541267
Research Article

The Effect of Graphene on the Protective Properties of Water-Based Epoxy Coatings on Al2024-T3

Department of Chemical Engineering, Materials and Industrial Production, University of Napoli Federico II, Piazzale Tecchio 80, 80125 Napoli, Italy

Correspondence should be addressed to T. Monetta

Received 14 March 2017; Revised 21 April 2017; Accepted 3 May 2017; Published 25 May 2017

Academic Editor: Flavio Deflorian

Copyright © 2017 T. Monetta et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

0.5 and 1% wt. of graphene nanoflakes were added to an anticorrosive additives-free water-based epoxy resin applied to Al2024-T3 samples. Calorimetric (DSC) and adhesion (cross-cut test) tests indicated that the presence of graphene did not affect the polymerization process of the resin or its adhesion to the substrate while it had some effect on its wettability. Electrochemical Impedance Spectroscopy (EIS) results obtained suggested that the addition of a small amount of graphene greatly enhanced the protective properties of the epoxy coating, retarding electrolytes absorption and reducing the total amount of adsorbed water. The latter occurrence suggests that the graphene effect on coating performances is related to both extended diffusion pathway length and graphene/matrix interaction due to the unique properties of graphene.