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.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

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


    Additional title:

    Elektrochemisches Verhalten von Mg-reichem Primer beim Schutz von Al-Legierungen


    Contributors:

    Published in:

    Corrosion Science ; 48 , 5 ; 1292-1306


    Publication date :

    2006


    Size :

    15 Seiten, 12 Bilder, 18 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Electrochemical Studies Of Aluminum Coated With Primer

    Danford, Merlin D. / Knockemus, Ward W. | NTRS | 1989


    Improved fabrication primer for protection of steel

    Rudlowski, G. / Moffatt, W. | Tema Archive | 1975


    A Primer - Automotive Finishing and Corrosion Protection

    Tudor,W.E. / General Motors,Pontiac Div.,US | Automotive engineering | 1978


    A PRIMER - AUTOMOTIVE FINISHING AND CORROSION PROTECTION

    Tudor, William E. | SAE Technical Papers | 1978