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Polymers 2017, 9(5), 178; doi:10.3390/polym9050178

Intensification of Electrochemical Performance of AA7075 Aluminum Alloys Using Rare Earth Functionalized Water-Based Polymer Coatings

1
Instituto Politécnico Nacional, CICATA-Altamira, Grupo CIAMS, Km 14.5 Carretera Tampico-Puerto Industrial Altamira, C.P. 89600 Altamira, Mexico
2
Department of Chemical and Biomolecular Engineering, Corrosion Engineering Program, Whitby Hall 211, The University of Akron, Akron, OH 44325-3906, USA
3
TecNM, Instituto Tecnológico de Ciudad Madero, D.E.P.I. Ave Primero de Mayo S.N. Col. Los Mangos, C.P. 89449 Cd Madero, Mexico
4
CONACYT Research Fellow–CICATA-Altamira, Ave. Insurgentes Sur 1582, Col. Crédito Constructor, Del. Benito Juárez, C.P. 03940. Cd De Mexico, Mexico
*
Author to whom correspondence should be addressed.
Academic Editors: Francesco Paolo La Mantia and Wei Min Huang
Received: 21 March 2017 / Revised: 28 April 2017 / Accepted: 16 May 2017 / Published: 18 May 2017
(This article belongs to the Special Issue Polymer Nanocomposites)
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Abstract

This work reports the effect of different amounts of ceria nanoparticles on UV resistance and barrier properties of water-based polyurethane (WPU) on glass and AA7075 aluminum alloy substrates. Hybrid coatings were synthesized from an aliphatic WPU–HDI (1,6-hexamethylene di-isocyanate) and cerium oxide nanoparticles (CeO2) with an average particle size distribution of about 25 nm. Different nanoceria amounts (1, 3 and 5 wt %), mixing times (30, 60 and 120 min) and methods to disperse the nanostructures into the polymer matrix (magnetic stirring and sonication) were evaluated. Initially, the dispersion of CeO2 nanoparticles embedded in the polymer matrix and displacement in the corrosion potential (Ecorr) were analyzed by confocal scanning laser microscopy (CLSM) and open circuit potential (Eocp) measurements. According to this behavior, the dispersion and water ratio required during the polymerization process were established. Coated samples obtained after the second stage were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and optical light microscopy. In addition, optical measurements on glass substrates were evaluated with UV-vis spectroscopy. The effect of the synthesis parameters on the corrosion behavior of WPU–CeO2/AA7075 systems was investigated with Eocp and electrochemical impedance spectroscopy (EIS) in a 3 wt % NaCl solution. In addition, the films were subjected to 180 h of accelerated weathering. The results show that the combination of specific nanoceria addition with the optimal synthesis parameters enhances optical transparence of WPU as well as barrier properties. From these, the coated specimens prepared with 3 wt % of ceria content and sonicated for 30 min showed a highly dispersed system, which results in a high charge transfer resistance. The observed properties in clear coats deposited on metallic substrates suggested an improvement in the appearance and less deterioration in UV exposure in comparison with pure WPU, enhancing the protective properties of the AA7075 aluminum alloy when exposed to a corrosive medium. View Full-Text
Keywords: aluminum alloys; AA7075; hybrid coatings; polyurethane; cerium oxide (CeO2); nanostructures; coatings; corrosion protection aluminum alloys; AA7075; hybrid coatings; polyurethane; cerium oxide (CeO2); nanostructures; coatings; corrosion protection
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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. (CC BY 4.0).

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MDPI and ACS Style

Ferrel-Álvarez, A.C.; Domínguez-Crespo, M.A.; Torres-Huerta, A.M.; Cong, H.; Brachetti-Sibaja, S.B.; López-Oyama, A.B. Intensification of Electrochemical Performance of AA7075 Aluminum Alloys Using Rare Earth Functionalized Water-Based Polymer Coatings. Polymers 2017, 9, 178.

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