Abstract
0.3wt % ammonium fluoride (NH4F) or ammonium chloride (NH4Cl) was added to ethylene glycol (EG) as an active ingredient for the formation of anodic oxide comprising of ZrO2 nanotubes (ZNTs) by anodic oxidation of zirconium (Zr) at 20V for 10min. It was observed that nanotubes were successfully grown in EG/NH4F/H2O with aspect ratio of 144.3. Shorter tubes were formed in EG/NH4F/H2O2. This could be due to higher excessive chemical etching at the tip of the tubes. When fluoride was replaced by chloride in both electrolytes, multilayered oxide resembling pyramids was observed. The pyramids have width at the bottom of 3-4μm and the top is 1-2μm with 10.7μm height. Oxidation of Zr in EG/NH4Cl/H2O2 was rater rapid. The multilayered structure is thought to have formed due to the re-deposition of ZrO2 or hydrated ZrO2 on the foil inside pores formed within the oxide layer. XRD result revealed an amorphous structure for as-anodized samples regardless of the electrolytes used for this work.
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