Exploring the possibility of protective surface oxides upon Mg alloy AZ31 via lutetium additions
2014
Samaniego, Alejandro | Gusieva, K. | Llorente, Irene | Feliú Jr., S. | Birbilis, N.
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 300 min. Lu was not detected in the ¿-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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