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Effect of thermal oxidation on the oxide characteristic and corrosion behavior of Ni60Nb40 amorphous ribbon in nitric acid
2019 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 479, p. 430-439Article in journal (Refereed) Published
Abstract [en]

The air-oxidation is a useful processing treatment to improve the corrosion resistance of Ni60Nb40 amorphous alloy. The oxidation kinetics of Ni60Nb40 amorphous ribbon follow two stage parabolic rate laws at 450 °C and 550 °C. The XPS analysis revealed that the surface of oxidized sample at 450 °C is enriched with Nb2O5, while oxidized sample at 550 °C, comprises of NiO and Ni2O3. The Mott-Schottky analyses confirmed the formation of n-type semiconducting film on the 450 °C oxidized sample in the nitric acid medium, while p-type semiconducting film on the 550 °C oxidized sample. Potentiodynamic polarization and EIS studies show that oxide film on the 450 °C oxidized sample exhibits highly protective barrier to the nitric acid when compared to the oxide film at 550 °C.

Place, publisher, year, edition, pages
2019. Vol. 479, p. 430-439
Keywords [en]
Acid solution, EIS, Polarization, XPS, Semiconducting, Transpassivity
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:du-31400DOI: 10.1016/j.apsusc.2019.02.089OAI: oai:DiVA.org:du-31400DiVA, id: diva2:1381205
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/S0169433219304325

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Jayamani, Jayaraj

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