Corrosion behaviour of friction stir welded AA7108 T79 aluminium alloy

The corrosion behaviour of a friction stir welded AA7108 T79 aluminium alloy has been investigated using accelerated testing (ASTM G34 EXCO) and electrochemical measurements. The welded alloy showed the expected zones associated with friction stir welding, namely nugget, thermomechanically affected...

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Bibliographic Details
Published in:Corrosion science 2006-04, Vol.48 (4), p.887-897
Main Authors: Wadeson, D.A., Zhou, X., Thompson, G.E., Skeldon, P., Oosterkamp, L. Djapic, Scamans, G.
Format: Article
Language:English
Subjects:
Aluminium (A)
Applied sciences
Corrosion
Corrosion environments
Exact sciences and technology
Intergranular corrosion (C)
Joining, thermal cutting: metallurgical aspects
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Welding
Welding (C)
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Summary:The corrosion behaviour of a friction stir welded AA7108 T79 aluminium alloy has been investigated using accelerated testing (ASTM G34 EXCO) and electrochemical measurements. The welded alloy showed the expected zones associated with friction stir welding, namely nugget, thermomechanically affected zone and heat affected zone. Corrosion testing revealed that the edge regions of the thermomechanically affected zone were most susceptible to corrosion. The localized corrosion occurs intergranularly due to the non-uniform distribution of η/ η′ (MgZn 2) precipitates within the thermomechanically affected zone.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2005.02.020