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Erschienen in: Journal of Materials Engineering and Performance 4/2018

28.02.2018

Microstructure, Phase Occurrence, and Corrosion Behavior of As-Solidified and As-Annealed Al-Pd Alloys

verfasst von: Libor Ďuriška, Marián Palcut, Martin Špoták, Ivona Černičková, Ján Gondek, Pavol Priputen, Roman Čička, Dušan Janičkovič, Jozef Janovec

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 4/2018

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Abstract

In the present work, we studied the microstructure, phase constitution, and corrosion performance of Al88Pd12, Al77Pd23, Al72Pd28, and Al67Pd33 alloys (metal concentrations are given in at.%). The alloys were prepared by repeated arc melting of Al and Pd granules in argon atmosphere. The as-solidified samples were further annealed at 700 °C for 500 h. The microstructure and phase constitution of the as-solidified and as-annealed alloys were studied by scanning electron microscopy, energy-dispersive x-ray spectroscopy, and x-ray diffraction. The alloys were found to consist of (Al), ε n (~ Al3Pd), and δ (Al3Pd2) in various fractions. The corrosion testing of the alloys was performed in aqueous NaCl (0.6 M) using a standard 3-electrode cell monitored by potentiostat. The corrosion current densities and corrosion potentials were determined by Tafel extrapolation. The corrosion potentials of the alloys were found between − 763 and − 841 mV versus Ag/AgCl. An active alloy dissolution has been observed, and it has been found that (Al) was excavated, whereas Al in ε n was de-alloyed. The effects of bulk chemical composition, phase occurrence and microstructure on the corrosion behavior are evaluated. The local nobilities of ε n and δ are discussed. Finally, the conclusions about the alloy’s corrosion resistance in saline solutions are provided.

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Metadaten
Titel
Microstructure, Phase Occurrence, and Corrosion Behavior of As-Solidified and As-Annealed Al-Pd Alloys
verfasst von
Libor Ďuriška
Marián Palcut
Martin Špoták
Ivona Černičková
Ján Gondek
Pavol Priputen
Roman Čička
Dušan Janičkovič
Jozef Janovec
Publikationsdatum
28.02.2018
Verlag
Springer US
Erschienen in
Journal of Materials Engineering and Performance / Ausgabe 4/2018
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-018-3245-6

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