Journal of Materials Engineering and Performance

, Volume 27, Issue 4, pp 1601–1613 | Cite as

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

  • Libor Ďuriška
  • Marián Palcut
  • Martin Špoták
  • Ivona Černičková
  • Ján Gondek
  • Pavol Priputen
  • Roman Čička
  • Dušan Janičkovič
  • Jozef Janovec
Article
  • 62 Downloads

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.

Keywords

Al-Pd alloys corrosion resistance intermetallic microstructure characterization potentiodynamic polarization 

Notes

Acknowledgements

The authors wish to thank the European Regional Development Fund (ERDF) for financial support of the project ITMS:26220120048 “Center for Development and Application of Advanced Diagnostic Methods in Processing of Metallic and Non-metallic Materials” funded within the Research & Development Operational Programme, the Grant Agency VEGA for the financial support under contracts 1/0018/15 and 1/0465/15, and the Slovak Research and Development Agency for the financial support under the contract APVV-15-0049.

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Copyright information

© ASM International 2018

Authors and Affiliations

  1. 1.Faculty of Materials Science and Technology in TrnavaSlovak University of Technology in BratislavaTrnavaSlovak Republic
  2. 2.Institute of PhysicsSlovak Academy of SciencesBratislavaSlovak Republic
  3. 3.Slovak University of Technology in BratislavaBratislavaSlovak Republic

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