Corrosion protection of AA2024-T3 by \LDH\ conversion films. Analysis of \SVET\ results
By J. Tedim and A.C. Bastos and S. Kallip and M.L. Zheludkevich and M.G.S. Ferreira
Published in Electrochimica Acta
NULL
2016
Abstract
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.
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