Corrosion protection of AA2024-T3 by LDH conversion films. Analysis of SVET results

In this work the protective effect of layered double hydroxide (LDH) films directly grown on the surface of 2024-T3 aluminium alloy is investigated using electrochemical impedance spectroscopy (EIS) and the scanning vibrating electrode technique (SVET). The SVET results focused on the localised natu...

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Bibliographic Details
Published in:Electrochimica acta 2016-08, Vol.210, p.215-224
Main Authors: Tedim, J., Bastos, A.C., Kallip, S., Zheludkevich, M.L., Ferreira, M.G.S.
Format: Article
Language:English
Subjects:
2024-T3 aluminium alloy
LDH films
neutral inhibition
pitting corrosion
SVET
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Summary:In this work the protective effect of layered double hydroxide (LDH) films directly grown on the surface of 2024-T3 aluminium alloy is investigated using electrochemical impedance spectroscopy (EIS) and the scanning vibrating electrode technique (SVET). The SVET results focused on the localised nature of the corrosion process and are in agreement with the global response measured by EIS. Furthermore, the evolution of active corrosion protection rendered by LDH films is surveyed at microscale for the first time for long immersion periods in NaCl solution and in the presence of induced defects. The quantitative information provided by SVET is discussed and a parameter to describe the degree of corrosion localisation is introduced based on LDH systems.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2016.05.134