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Effect of thermally grown amorphous oxide film on the corrosion resistance properties of Ni50Zr25Nb25 metallic glass in nitric acid medium
2019 (engelsk)Inngår i: Intermetallics (Barking), ISSN 0966-9795, E-ISSN 1879-0216, Vol. 113Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In the presents work, the effects of the surface oxidation of the Ni50Zr25Nb25 metallic glass on the corrosion behavior in nitric acid environment were investigated. The oxidation kinetics at 200 and 400 °C in air environment followed two-stage rate law. SEM and XPS investigation revealed the surface of thin (106 nm) amorphous oxide film composed of NiO, Ni2O3, ZrO2, and Nb2O5 when sample was oxidized at 200 °C. However, oxidation at 400 °C resulted in a thicker (721 nm) amorphous oxide film, enriched with only ZrO2 and Nb2O5. Potentiodynamic polarization results of the thermally oxidized metallic glass at 400 °C exhibited the wider passive range and significantly higher corrosion resistance in concentrated nitric acid when compared to the as-prepared and oxidized sample at 200 °C. After polarization at 2.2 V (Vs. Ag/AgCl), thermally oxidized sample at 400 °C exhibits smooth surface while the as-prepared MG undergoes a severe dissolution in 11.5 M nitric acid.

sted, utgiver, år, opplag, sider
2019. Vol. 113
Emneord [en]
Metallic glasses, Oxidation, Electrochemical corrosion, Oxide film, XPS, Nitric acid
HSV kategori
Identifikatorer
URN: urn:nbn:se:du-31407DOI: 10.1016/j.intermet.2019.106571OAI: oai:DiVA.org:du-31407DiVA, id: diva2:1381214
Tilgjengelig fra: 2019-12-20 Laget: 2019-12-20 Sist oppdatert: 2019-12-20bibliografisk kontrollert

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Forlagets fullteksthttp://www.sciencedirect.com/science/article/pii/S0966979519303991

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