Author:
James Andre,North Thomas H.,Thorpe Steven J.
Abstract
A scanning reference electrode technique (SRET) apparatus has been designed and commissioned to investigate the corrosion of friction stir spot welds (FSSW) made in AZ31 magnesium alloys. The operational parameters of the apparatus have been calibrated to give adequate spatial resolution. By combining the SRET data with material flow data and immersion test data it was found that the FSSW process causes the formation of distinct noble and active regimes within the weld area. The noble region is aligned with the stir zone (SZ) and is caused by a dynamically recrystallized grain structure which are void of dislocations/twins, and β Mg17Al12 . Localized corrosion attack was observed in both SRET and immersion testing along the thermo-mechanically affected zone (TMAZ). The same effect was consistently observed with a flat versus concave shoulder tool, and dwell times of 1s and 4s.
Publisher
The Electrochemical Society
Cited by
11 articles.
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