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 Mg17Al12 (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.
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16 October 2017
E. A. McNally’s name appeared incorrectly on the original publication of this article. It appears correctly here.
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Acknowledgements
We thank the Automotive Partnerships Canada (APC) program for providing financial support and the Magnesium Front End Research and Development (MFERD) partnership for providing the front end sub-assemblies for testing.
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A correction to this article is available online at https://doi.org/10.1007/s11837-017-2624-z.
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Kish, J.R., Birbilis, N., McNally, E.M. et al. Corrosion Performance of Friction Stir Linear Lap Welded AM60B Joints. JOM 69, 2335–2344 (2017). https://doi.org/10.1007/s11837-017-2504-6
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DOI: https://doi.org/10.1007/s11837-017-2504-6