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Sr is known to transform the morphology of the eutectic silicon phase as well as the Fe-rich β phase in Al-Si alloys, improving their mechanical properties. However, little is known about the effect Sr has on the (local) corrosion properties of aluminium alloys. This study investigates the effect of Sr addition to a modified AA3003 heat exchanger material on the morphology of the different phases present, especially the Fe-rich phases, as well as on the (local) corrosion properties of this material. This work reports the formation of a Sr-rich phase, which slightly increases the macrohardness of the material. The Fe-rich phases are not shown to be refined/influenced by the addition of Sr Potentiodynamic polarization experiments showed an increase in pitting potential by increasing the amount of Sr in the material up to 0.4 wt.%. Nevertheless, the analysis of the corrosion morphology revealed that the Sr-containing particles did not contribute to the corrosion process despite their cathodic behaviour compared to the Al matrix as measured by Scanning Kelvin Probe Force Microscopy. This behaviour was attributed to the thicker oxide layer found on the Sr-rich particles.
Originele taal-2English
Artikelnummer021506
Aantal pagina's9
TijdschriftJournal of the Electrochemical Society
Volume168
Nummer van het tijdschrift2
DOI's
StatusPublished - 3 feb 2021

Bibliografische nota

Publisher Copyright:
© 2021 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited.

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

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