Corrosion Behaviour of Friction Stir Welded Aluminium Alloys: Unpredictability and Protection-Crimson Publishers
Corrosion Behaviour of Friction Stir Welded Aluminium Alloys: Unpredictability and Protection by Uyime Donatus* in Crimson Publishers: Peer Reviewed Material Science Journals
The
corrosion susceptible regions in friction stir weldments of aluminium alloys
are largely unpredictable. Several factors dictate the undesirable
susceptibility of an Al alloy friction stir weldment. A change in temper or
processing parameters can significantly alter the corrosion behaviour of an Al
alloy weldment. Pronounced zonal heterogeneities induced by the welding process
causes increased corrosion rate of the susceptible region due to galvanic
coupling with the more noble regions. To prevent this, different protection
methods and techniques have been employed and are currently being developed.
Laser surface melting, post-weld heat treatment, micro-arc oxidation,
application of corrosion resistant material, conventional anodizing, and
pre-sputter deposition prior to anodizing have all been shown to improve the
corrosion resistance of friction stir weldments of different Al alloys.
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