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Self-organized nanotubular layer on Ti–4Zr–22Nb–2Sn alloys formed in organic electrolytes

Published online by Cambridge University Press:  31 January 2011

Yanqin Liang
Affiliation:
School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
Xianjin Yang
Affiliation:
School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China; and Tianjin Key Laboratory of Composite and Functional Materials, Tianjin 300072, China
Zhenduo Cui
Affiliation:
School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
Shengli Zhu*
Affiliation:
School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China; and Tianjin Key Laboratory of Composite and Functional Materials, Tianjin 300072, China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Self-organized nanotubular layers are electrochemically fabricated on Ti–4Zr–22Nb–2Sn alloys in water/glycerol (volume ratio 1:1) mixtures containing 0.3 M NH4F. Highly ordered nanotubes with two distinct diameters of ∼203 ± 5 (large size) and 113 ± 5 nm (small size) were observed at the bottom of the layer, which may be ascribed to the different microstructure and composition in this alloy. On extended anodization, the small-size tubes gradually disappeared because of the increasing H+. After annealing for 1 h at 500 °C, the nanotube layer on the Ti–4Zr–22Nb–2Sn alloy was transformed from the amorphous phase to anatase. The nanotubes were connected to each other by spaced rings at the sidewalls, whereas the distance between neighboring rings increased with the amplitude of applied current density.

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Articles
Copyright
Copyright © Materials Research Society 2009

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