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Passive film characteristics and corrosion behavior of thermally oxidized Ni60Nb30Ta10 metallic glass in nitric acid medium
2019 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 783, p. 680-686Article in journal (Refereed) Published
Abstract [en]

X-ray photoelectron spectroscopy (XPS) analyses confirmed the formation of different oxides upon thermal air oxidation (TO) of Ni60Nb30Ta10 metallic glass (MG) below the glass transition temperature. At 450 °C (450 TO-MG), surface of the oxide film was enriched with Nb2O5 (65%) and Ta2O5 (26%). Similarly, at 550 °C (550 TO-MG), the upper oxide layer was composed with NiO (67%), Ni2O3 (28.5%) and small fraction metallic Ni (4.5%). The electrochemical corrosion behavior of the thermally oxidized metallic glass samples was studied in 1, 6 and 11.5 M nitric acid at room temperature. Mott-Schottky analyses in nitric acid solutions confirmed the n-type semiconducting nature of the film for as-spun MG. On the other hand, the films formed on 450 TO-MG, and 550 TO-MG exhibited insulating and p-type, respectively. The donor (n-type) and acceptor (p-type) densities increases as the solution concentration increased. In nitric acid solutions, the current densities values obtained from potentiodynamic polarization studies indicated that 450 TO-MG exhibited higher corrosion resistance than the as-spun and 550 TO-MG samples.

Place, publisher, year, edition, pages
2019. Vol. 783, p. 680-686
Keywords [en]
A. Metallic glasses, B. Rapid-solidification, C. Oxidation, C. Electronic properties, C. Corrosion, D. Photoelectron spectroscopies
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:du-31403DOI: 10.1016/j.jallcom.2018.12.335OAI: oai:DiVA.org:du-31403DiVA, id: diva2:1381209
Available from: 2019-12-20 Created: 2019-12-20 Last updated: 2019-12-20Bibliographically approved

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Publisher's full texthttp://www.sciencedirect.com/science/article/pii/S0925838818348977

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Jayamani, Jayaraj

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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  • nn-NB
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