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Corrosion behaviour of friction stir welded AA7108 T79 aluminium alloy |
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| Authors: | D.A. Wadeson G.E. Thompson L. Djapic Oosterkamp |
| Affiliation: | a Corrosion and Protection Centre, UMIST, P.O. Box 88, Manchester M60 1QD, UK b R&D Materials Technology, Hydro Aluminium, N-4265 Havik, Norway c Innoval Technology Limited, Beaumont Close, Banbury, Oxfordshire OX16 1TQ, UK |
| Abstract: | 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′ (MgZn2) precipitates within the thermomechanically affected zone. |
| Keywords: | Aluminium (A) Welding (C) Intergranular corrosion (C) |
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