Corrosion protection of clad 2024 aluminum alloy anodized in tartaric-sulfuric acid bath and protected with hybrid sol–gel coating

Autor:	H.G. de Melo, Marie-Georges Olivier, R. P. B. Hernandez, Vera Rosa Capelossi, Isaline Recloux, M. Poelman
Rok vydání:	2014
Předmět:	Glow discharge Materials science Anodizing Scanning electron microscope General Chemical Engineering Alloy Metallurgy Sulfuric acid engineering.material Dielectric spectroscopy Corrosion chemistry.chemical_compound chemistry Chemical engineering Coating Electrochemistry engineering
Zdroj:	Electrochimica Acta. 124:69-79
ISSN:	0013-4686
Popis:	Clad AA2024 T3 specimens were anodized in a tartaric-sulfuric acid bath (TSA) and subsequently protected either by classical Cr-free water sealing treatment or by application of a hybrid sol–gel coating. The sol–gel coating was prepared using a solution with high water content (58 %v/v) and obtained by the hydrolysis and condensation of tetraethoxysilane (TEOS) and 3-glycidoxypropyltrimethoxysilane (GPTMS). The morphology of the sealed anodic films and their thicknesses were evaluated by scanning electron microscopy (SEM), field emission scanning electron microscopy (FE-SEM) and glow discharge optical emission spectrometry (GDOES). The corrosion resistance of the samples was evaluated by electrochemical impedance spectroscopy (EIS) and salt-spray test. The results showed that the treatment with the hybrid sol–gel increased the resistive properties of the pores compared to the classical water sealing, delaying the access of aggressive species to the barrier layer.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8b8e7169f8152c049fca6e8b2f03f726 https://doi.org/10.1016/j.electacta.2013.09.004 Zobrazit plný text záznamu Full Text from ScienceDirect