Electrochemical behaviour of a Mg-rich primer in the protection of Al alloys

The electrochemical behaviour of Mg-rich primer on Al Alloys, AA2024 and AA7075, has been studied via Electrochemical Impedance Spectroscopy (EIS), Open Circuit Potential (OCP) and potentiodynamic polarization. Results showed that the Mg-rich primer provides sacrificial protection to the Al substrat...

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Published in:Corrosion science 2006-05, Vol.48 (5), p.1292-1306
Main Authors: Battocchi, D., Simões, A.M., Tallman, D.E., Bierwagen, G.P.
Format: Article
Language:English
Subjects:
AA2024
AA7075
Applied sciences
Corrosion
Corrosion environments
EIS
Exact sciences and technology
Metals. Metallurgy
Mg-rich primer
OCP
Potentiodynamic polarization
Sacrificial protection
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creator Battocchi, D.
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description The electrochemical behaviour of Mg-rich primer on Al Alloys, AA2024 and AA7075, has been studied via Electrochemical Impedance Spectroscopy (EIS), Open Circuit Potential (OCP) and potentiodynamic polarization. Results showed that the Mg-rich primer provides sacrificial protection to the Al substrate by a two-stage mechanism. In a first stage, corrosion of aluminium is prevented by cathodic polarization, whereas at a later stage the precipitation of a porous barrier layer of magnesium oxide was observed.
doi_str_mv 10.1016/j.corsci.2005.04.008
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subjects AA2024
AA7075
Applied sciences
Corrosion
Corrosion environments
EIS
Exact sciences and technology
Metals. Metallurgy
Mg-rich primer
OCP
Potentiodynamic polarization
Sacrificial protection
title Electrochemical behaviour of a Mg-rich primer in the protection of Al alloys
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