Abstract
In the present study, Mg-alloy AZ31 was alloyed with low-level lutetium (Lu) additions, with the aim of generating a more protective surface oxide/film. To stimulate Lu-rich surface films, AZ31+Lu specimens were heat treated at 400°C for up to 300min. Lu was not detected in the α-Mg matrix by EDXS; instead it was incorporated in Al–Mn–Lu particles. Micro-additions of Lu promoted a significant reduction of corrosion rates of as-cast AZ31, although Lu was not detected in the surface oxide as determined by XPS. The subsequent heat treatment of as-cast AZ31+Lu had a negative impact upon corrosion.
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