Electrochemical corrosion of Al-Pd alloys in HCl and NaOH solutions
The corrosion performance of as-solidified Al-Pd alloys in HCl and NaOH aqueous solutions is investigated in this work. Four different alloys (Al88Pd12, Al77Pd23, Al72Pd28 and Al67Pd33, element concentrations are given in at.%) were prepared from high purity Al and Pd lumps by arc-melting i...
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| Format: | Article |
| Language: | English |
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University of Belgrade, Technical Faculty, Bor
2017-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
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| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2017/1450-53391700015P.pdf |
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| author | Palcut M. Ďuriška L. Špoták M. Vrbovský M. Gerhátová Ž. Černičková I. Janovec J. |
| author_facet | Palcut M. Ďuriška L. Špoták M. Vrbovský M. Gerhátová Ž. Černičková I. Janovec J. |
| author_sort | Palcut M. |
| collection | DOAJ |
| description | The corrosion performance of as-solidified Al-Pd alloys in HCl and NaOH
aqueous solutions is investigated in this work. Four different alloys
(Al88Pd12, Al77Pd23, Al72Pd28 and Al67Pd33, element concentrations are given
in at.%) were prepared from high purity Al and Pd lumps by arc-melting in Ar.
Subsequently, the alloy microstructure and phase occurrence were investigated
by a combination of scanning electron microscopy and room-temperature powder
X-ray diffraction. The assolidified Al-Pd alloys were found to consist of
several single-phase microstructure constituents with various structures and
chemical compositions, including structurally complex intermetallic phases.
The polished surfaces of the Al-Pd alloys were subjected to electrochemical
polarization in aqueous HCl and NaOH solutions (0.01 mol.dm-3) at 21±2°C. The
corrosion experiments were conducted in a standard 3-electrode cell
controlled by potentiostat. The corrosion potentials and corrosion current
densities were determined by Tafel extrapolation of the experimental
polarization curves. Phase dissolution has been observed on the alloy
surfaces and some of the phases were preferentially corroded. The effects of
the alloy microstructure and the phase occurrence are evaluated. The local
nobility of individual intermetallic compounds is discussed. Finally, the
conclusions for the alloys corrosion performance in acidic and basic
solutions are provided. |
| format | Article |
| id | doaj-art-43bc13cdca3a4a45bd3d881a3aad0b26 |
| institution | Kabale University |
| issn | 1450-5339 2217-7175 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | University of Belgrade, Technical Faculty, Bor |
| record_format | Article |
| series | Journal of Mining and Metallurgy. Section B: Metallurgy |
| spelling | doaj-art-43bc13cdca3a4a45bd3d881a3aad0b262025-02-02T20:47:50ZengUniversity of Belgrade, Technical Faculty, BorJournal of Mining and Metallurgy. Section B: Metallurgy1450-53392217-71752017-01-0153333334010.2298/JMMB170425015P1450-53391700015PElectrochemical corrosion of Al-Pd alloys in HCl and NaOH solutionsPalcut M.0Ďuriška L.1Špoták M.2Vrbovský M.3Gerhátová Ž.4Černičková I.5Janovec J.6Slovak University of Technology in Bratislava, Faculty of Materials Science and Technology in Trnava, Trnava, SlovakiaSlovak University of Technology in Bratislava, Faculty of Materials Science and Technology in Trnava, Trnava, SlovakiaSlovak University of Technology in Bratislava, Faculty of Materials Science and Technology in Trnava, Trnava, SlovakiaSlovak University of Technology in Bratislava, Faculty of Materials Science and Technology in Trnava, Trnava, SlovakiaSlovak University of Technology in Bratislava, Faculty of Materials Science and Technology in Trnava, Trnava, SlovakiaSlovak University of Technology in Bratislava, Faculty of Materials Science and Technology in Trnava, Trnava, SlovakiaSlovak University of Technology in Bratislava, University Science Park, Bratislava, SlovakiaThe corrosion performance of as-solidified Al-Pd alloys in HCl and NaOH aqueous solutions is investigated in this work. Four different alloys (Al88Pd12, Al77Pd23, Al72Pd28 and Al67Pd33, element concentrations are given in at.%) were prepared from high purity Al and Pd lumps by arc-melting in Ar. Subsequently, the alloy microstructure and phase occurrence were investigated by a combination of scanning electron microscopy and room-temperature powder X-ray diffraction. The assolidified Al-Pd alloys were found to consist of several single-phase microstructure constituents with various structures and chemical compositions, including structurally complex intermetallic phases. The polished surfaces of the Al-Pd alloys were subjected to electrochemical polarization in aqueous HCl and NaOH solutions (0.01 mol.dm-3) at 21±2°C. The corrosion experiments were conducted in a standard 3-electrode cell controlled by potentiostat. The corrosion potentials and corrosion current densities were determined by Tafel extrapolation of the experimental polarization curves. Phase dissolution has been observed on the alloy surfaces and some of the phases were preferentially corroded. The effects of the alloy microstructure and the phase occurrence are evaluated. The local nobility of individual intermetallic compounds is discussed. Finally, the conclusions for the alloys corrosion performance in acidic and basic solutions are provided.http://www.doiserbia.nb.rs/img/doi/1450-5339/2017/1450-53391700015P.pdfAluminiumPalladiumComplex metallic alloysCorrosionAlloy dissolution |
| spellingShingle | Palcut M. Ďuriška L. Špoták M. Vrbovský M. Gerhátová Ž. Černičková I. Janovec J. Electrochemical corrosion of Al-Pd alloys in HCl and NaOH solutions Journal of Mining and Metallurgy. Section B: Metallurgy Aluminium Palladium Complex metallic alloys Corrosion Alloy dissolution |
| title | Electrochemical corrosion of Al-Pd alloys in HCl and NaOH solutions |
| title_full | Electrochemical corrosion of Al-Pd alloys in HCl and NaOH solutions |
| title_fullStr | Electrochemical corrosion of Al-Pd alloys in HCl and NaOH solutions |
| title_full_unstemmed | Electrochemical corrosion of Al-Pd alloys in HCl and NaOH solutions |
| title_short | Electrochemical corrosion of Al-Pd alloys in HCl and NaOH solutions |
| title_sort | electrochemical corrosion of al pd alloys in hcl and naoh solutions |
| topic | Aluminium Palladium Complex metallic alloys Corrosion Alloy dissolution |
| url | http://www.doiserbia.nb.rs/img/doi/1450-5339/2017/1450-53391700015P.pdf |
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