Localized corrosion of a 2219 aluminium alloy exposed to a 3.5% NaCl solution

This work is focused on the role of intermetallics in pitting corrosion of Al2219 alloy. Second phase particles were characterized by AES, SAM and EDX. Their behaviour in a solution of NaCl was investigated as a function of exposure time. The results confirmed the cathodic nature of the intermetalli...

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Bibliographic Details
Published in:Corrosion science 2010-09, Vol.52 (9), p.2855-2866
Main Authors: Grilli, Rossana, Baker, Mark A., Castle, James E., Dunn, Barrie, Watts, John F.
Format: Article
Language:English
Subjects:
A. Aluminium alloy
A. Intermetallics
Acoustic microscopes
Aluminium
Aluminum
Applied sciences
B. AES
C. Corrosion
Corrosion
Corrosion environments
Exact sciences and technology
Intermetallics
Iron
Localized corrosion
Manganese
Metals. Metallurgy
Pitting (corrosion)
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Summary:This work is focused on the role of intermetallics in pitting corrosion of Al2219 alloy. Second phase particles were characterized by AES, SAM and EDX. Their behaviour in a solution of NaCl was investigated as a function of exposure time. The results confirmed the cathodic nature of the intermetallics with respect to the aluminium matrix. Corrosion products rich in aluminium and oxygen were found to progressively accumulate around the particles and iron was dissolved from the intermetallic, followed by back-deposition. Copper and manganese did not show any major activity. After 32 h of exposure the larger intermetallics were completely covered.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2010.04.035