Microgalvanic activity of an Mg–Al–Ca-based alloy studied by scanning Kelvin probe force microscopy

An Mg–Al–Ca based alloy was investigated by scanning electron microscopy, energy dispersive spectroscopy and scanning Kelvin probe force microscopy following extrusion. The investigations revealed two main intermetallics, i.e. Al–Ca(Sn,Sr) and Al–Mn–Fe, both distributed along the extrusion direction...

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Bibliographic Details
Published in:Scripta materialia 2007-12, Vol.57 (11), p.1012-1015
Main Authors: Apachitei, I., Fratila-Apachitei, L.E., Duszczyk, J.
Format: Article
Language:English
Subjects:
Aluminum
Couples
Extrusion
Intermetallics
Magnesium alloys
Magnesium base alloys
Microgalvanic activity
Microscopy
Scanning
Scanning electron microscopy
Volta potential
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Summary:An Mg–Al–Ca based alloy was investigated by scanning electron microscopy, energy dispersive spectroscopy and scanning Kelvin probe force microscopy following extrusion. The investigations revealed two main intermetallics, i.e. Al–Ca(Sn,Sr) and Al–Mn–Fe, both distributed along the extrusion direction and having distinctive morphology. The microgalvanic couples, i.e. Al–Ca(Sn,Sr)/ α-Mg and Al–Mn–Fe/ α-Mg showed positive Volta potential differences with the Al–Mn–Fe intermetallic being the noblest (i.e. 262 ± 18 mV vs 62 ± 7 mV).
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2007.08.002