Aluminium alloys AA2024-T3 and AA7075-T6 are widely in the aircraft industry for their high strength and low density. Their high strength is achieved to the formation of intermetallic precipitates. This precipitates, mostly riche an copper, are responsible for the generation of potential differences along the surface that mater the alloys prone to localized corrosion. The mode to protection of these alloys by Mg-rich primer is the concern of the work. 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. The typically dissolution rate is significantly decreased but its incorporation in the polymer.
Electrochemical behaviour of a Mg-rich primer in the protection of Al alloys
Elektrochemisches Verhalten von Mg-reichem Primer beim Schutz von Al-Legierungen
Corrosion Science ; 48 , 5 ; 1292-1306
2006
15 Seiten, 12 Bilder, 18 Quellen
Article (Journal)
English
Korrosionsschutz , Lochkorrosion , Aluminiummagnesiumkupferlegierung , Flugzeugindustrie , Primer , Magnesiumverbindung , organischer Überzug , Polyvinylchlorid , potentiostatische Prüfung , Impedanzspektrometrie , kathodische Polarisation , Inkorporierung , Magnesiumoxid , Aluminiumzinkmagnesiumlegierung
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