• Lopes, A. B.
• Tuan, N. Q.
• Alves, Alexandra Manuela Vieira Cruz Pinto
• Pinto, Ana
• Toptan, Fatih

Abstract

The localized corrosion and electrochemical behaviour of Al-0.28 wt.% Sc and Al-0.24 wt.% Sc-0.07 wt.% Yb alloys have been studied in 3.5 wt.% NaCl solution. The results showed that the impurity intermetallic phases containing Fe can act as cathodes and promote localized corrosion in the surrounding matrix. Yb had strong effect on the polarization behaviour in the anodic domain of Al-Sc alloy by improving the pitting corrosion resistance of this alloy. It has been deduced that a high number density of fully coherent nano-sized Al3Sc or Al-3(Sc, Yb) precipitates in heat treated alloys can enhance the passivation tendency of these alloys. ; This research was supported by The Project Bridging The Gap, funded by the Erasmus Mundus External Cooperation Window Program. Acknowledgements also to the University of Minho, for the provision of research facilities ; info:eu-repo/semantics/publishedVersion

Topics

• density
• corrosion
• phase
• aluminium
• pitting corrosion
• transmission electron microscopy
• precipitate
• intermetallic
• Ytterbium
• Scandium