Correlation between electron work functions of multiphase Cu-8Mn-8Al and de-alloying corrosion
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Author list: Punburi P., Tareelap N., Srisukhumbowornchai N., Euaruksakul C., Yordsri V.
Publisher: Elsevier
Publication year: 2018
Journal: Applied Surface Science (0169-4332)
Volume number: 439
Start page: 1040
End page: 1046
Number of pages: 7
ISSN: 0169-4332
eISSN: 1873-5584
Languages: English-Great Britain (EN-GB)
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Abstract
Low energy electron emission microscopy (LEEM) was used to measure local transition energy that was directly correlated to electron work function (EWF) of multiphase manganese-aluminum bronze alloys. We developed color mapping to distinguish the EWF of multiple phases and clarified that the EWF were in the following order: EWF of α > EWF of β > EWF of κ (EWF α > EWF β > EWF κ ). De-alloying corrosion took place due to the micro-galvanic cell at grain boundaries before it propagated into the β phase that had lower EWF than the α phase. The α phase was a stable phase because it contained high Cu while the β phase contained high Al and Mn. In addition, XRD analysis showed that the texture coefficient of the β phase revealed that almost all of the grains had (2 2 0) orientation, the lowest EWF compared to (1 1 1) and (2 0 0). Furthermore, transmission electron microscopy illustrated that there were fine Cu 3 Mn 2 Al precipitates in the Cu 2 MnAl matrix of the β phase. These precipitates formed micro-galvanic cells which played an important role in accelerating de-alloying corrosion. © 2018 Elsevier B.V.
Keywords
De-alloying corrosion, Electron work function, LEEM, Mn-Al bronze
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