Abstract
Corrosion behaviour of friction stir welded (FSW) AlMg6Mn alloy was comparred to corrosion behaviour of as-hot rolledalloyby means of NAMLT and ASSET tests. Corrosion testing revealed that base metal (hot rolled state) is more susceptible to intergranular corrosion (IGC) than FSW specimens. Surface morphology of the base metal after NAMLT revealed sevire intergranular corrosion, while IGC resistance of AlMg6Mn alloy after FSW was significantly improved. It was attributed to different microstructure developped during welding, i.e. due to redistribution of β-phase particles and grain refining. On the other hand, both base metal and weld showed good exfoliation resistance evaluated by ASSET test.
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