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- Title
Corrosion Performance of Friction Stir Linear Lap Welded AM60B Joints.
- Authors
Kish, J.; Birbilis, N.; McNally, E.; Glover, C.; Zhang, X.; McDermid, J.; Williams, G.
- Abstract
A corrosion investigation of friction stir linear lap welded AM60B joints used to fabricate an Mg alloy-intensive automotive front end sub-assembly was performed. The stir zone exhibited a slightly refined grain size and significant break-up and re-distribution of the divorced MgAl (β-phase) relative to the base material. Exposures in NaCl (aq) environments revealed that the stir zone was more susceptible to localized corrosion than the base material. Scanning vibrating electrode technique measurements revealed differential galvanic activity across the joint. Anodic activity was confined to the stir zone surface and involved initiation and lateral propagation of localized filaments. Cathodic activity was initially confined to the base material surface, but was rapidly modified to include the cathodically-activated corrosion products in the filament wake. Site-specific surface analyses revealed that the corrosion observed across the welded joint was likely linked to variations in Al distribution across the surface film/metal interface.
- Subjects
MAGNESIUM alloy welding; FRICTION stir welding; WELDED joints; CORROSION resistance; GRAIN size; ELECTRODES
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2017, Vol 69, Issue 11, p2335
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-017-2504-6