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Formation Mechanism of Anodic Titanium Oxide in Mixed Electrolytes
Oct 30, 2017Author:
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Title: Formation Mechanism of Anodic Titanium Oxide in Mixed Electrolytes

 Authors: Liao, MY; Ma, HT; Yu, DL; Han, H; Xu, XR; Zhu, XF

 Author Full Names: Liao, Maoying; Ma, Hongtu; Yu, Dongliang; Han, Hua; Xu, Xuran; Zhu, Xufei

 Source: MATERIALS RESEARCH BULLETIN, 95 539-545; 10.1016/j.materresbull.2017.08.041 NOV 2017

 Language: English

 Abstract: The formation mechanism of anodic TiO2 nanotubes (ATNTs) remains mysterious and complicated. Usually, ATNTs are fabricated in pure NH4F electrolytes rather than mixed electrolytes and Ti anodizations are carried out under potentiostatic rather than galvanostatic conditions. In this work, anodizations under the potentiostatic and galvanostatic conditions are conducted. The formation processes of titanium oxide film in different mixed electrolytes are explored in detail. By changing the mass ratios of oxalic acid and ammonium fluoride, different kinds of anodic titanium oxide films are fabricated: the compact anodic titanium oxide (CATO) films, transient state anodic titanium oxide films and porous films (ATNTs). A distinct transform from CATO films into ATNTs was observed. Cavities within oxide and hemispheric bottoms are found, confirming the presence of oxygen bubble mould. Based on the electronic current and ionic current model, a consistent formation mechanism for three kinds of anodic titanium oxide films in mixed electrolytes is proposed.

 ISSN: 0025-5408

 eISSN: 1873-4227

 IDS Number: FJ0DK

 Unique ID: WOS:000412378500072

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