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Potentiodynamic Polarization Performance of a Novel Composite Coating System of Al2O3/Chitosan-Sodium Alginate, Applied on an Aluminum AA6063 Alloy for Protection in a Chloride Ions Environment

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CONACYT, Corporación Mexicana de Investigación en Materiales, Saltillo C.P. 25290, Coahuila, Mexico
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Centro de Investigación en Ingeniería y Ciencias Aplicadas-UAEM, Av. Universidad 1001, Col. Chamilpa, Cuernavaca 62210, Morelos, Mexico
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Instituto de Metalurgia, Universidad Autónoma de San Luis Potosí, Lomas Segunda Sección, No. 550, San Luis Potosí 78210, Mexico
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CONACYT-UASLP, Instituto de Metalurgia de la Universidad Autónoma de San Luis Potosí, Lomas Segunda Sección, No. 550, San Luis Potosí 78210, Mexico
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CONACYT-CIATEQ, Unidad San Luis Potosí, Eje 126 No. 225, Zona Industrial, San Luis Potosí C.P. 78395, Mexico
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CIATEQ, Unidad San Luis Potosí, Eje 126 No. 225, Zona Industrial, San Luis Potosí C.P. 78395, Mexico
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Authors to whom correspondence should be addressed.
Coatings 2020, 10(1), 45; https://doi.org/10.3390/coatings10010045
Received: 26 November 2019 / Revised: 28 December 2019 / Accepted: 31 December 2019 / Published: 3 January 2020
(This article belongs to the Section Corrosion, Wear and Erosion)
In this research work, a preliminary potentiodynamic polarization performance testing was carried out on a new environmentally friendly proposed composite coating. The proposed composite coating was developed by: (a) hot sulfuric anodizing to produce an Al2O3 conversion film followed by an (b) organic electrodeposited chitosan–sodium alginate blended film. Posteriorly, the conversion and organic films were microstructurally characterized by scanning electron microscopy. Finally, the polarization resistance technique was used to measure the corrosion resistance of the uncoated and coated AA6063 alloy in a simulated marine environment and the polarization tests were compared to samples immersed during 30 days in same electrolyte solution. The obtained inhibition corrosion efficiency of the proposed coating system was measured comparing the Rp of the uncoated alloy to the coated samples, showing an efficiency about 99% for a 3% NaCl electrolyte for some of the samples. Therefore, the experimental results obtained during this research demonstrates the feasibility of using the developed anticorrosive composite coating to protect aluminum alloys against chloride corrosive ions species and to further continue with the corresponding research. View Full-Text
Keywords: organic coatings; electrophoretic deposition; potentiodynamic polarization resistance organic coatings; electrophoretic deposition; potentiodynamic polarization resistance
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MDPI and ACS Style

Gallegos-Melgar, A.; Serna, S.A.; Lázaro, I.; Gutiérrez-Castañeda, E.-J.; Mercado-Lemus, V.H.; Arcos-Gutierrez, H.; Hernández-Hernández, M.; Porcayo-Calderón, J.; Mayen, J.; Monroy, M.D.A. Potentiodynamic Polarization Performance of a Novel Composite Coating System of Al2O3/Chitosan-Sodium Alginate, Applied on an Aluminum AA6063 Alloy for Protection in a Chloride Ions Environment. Coatings 2020, 10, 45.

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