OATAO - Open Archive Toulouse Archive Ouverte Open Access Week

Architectural optimization of an epoxy-based hybrid sol–gel coating for the corrosion protection of a cast Elektron21 magnesium alloy

Murillo-Gutiérrez, Noé Verner and Ansart, Florence and Bonino, Jean-Pierre and Kunst, S.R. and Malfatti, C.F. Architectural optimization of an epoxy-based hybrid sol–gel coating for the corrosion protection of a cast Elektron21 magnesium alloy. (2014) Applied Surface Science, 309. 62-73. ISSN 0169-4332

[img]
Preview
(Document in English)

PDF (Author's version) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
7MB

Official URL: http://dx.doi.org/10.1016/j.apsusc.2014.04.169

Abstract

An epoxy-based hybrid sol–gel coating was prepared in various architectural configurations has beenstudied for the corrosion protection of a cast Elektron21 magnesium alloy. The creation of a single layerof this coating presents defects consisting of macro-pores and protuberances, which opens access for cor-rosive species to reach the metallic substrate. These defects are suspected to result from the high reactivityof the substrate, as well as to the irregular topography of the substrate disrupted by the microstructureof the own magnesium alloy. Hence, a sol–gel coating in bilayer architecture is proposed, where the firstlayer would “inert” the surface of the magnesium substrate, and the second layer would cover the defectsof the first layer and also thickening the coating. The morphological characteristics of the sol–gel coatingswere analyzed by scanning electron microscopy (SEM), and their corrosion behavior was evaluated byOCP (open circuit potential) monitoring and electrochemical impedance spectroscopy (EIS) in chloridemedia. It is shown that both the architectural arrangement and the individual thickness of the first andsecond layers have an important influence on the anticorrosion performances of the protective system,just as much as its global thickness.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at : https://www.sciencedirect.com/science/article/pii/S0169433214009453
HAL Id:hal-01753426
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > Universidade Federal do Rio Grande do Sul - UFRGS (BRAZIL)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Laboratory name:
Statistics:download
Deposited By: cirimat webmestre
Deposited On:29 Mar 2018 14:25

Repository Staff Only: item control page