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Preparation and characterization of microporous layers on titanium
Shin-ichi Tanaka1, Haruki Tobimatsu, Yuuki Maruyama
1Department of Materials Science and Engineering, Kurume National College of Technology, 1-1-1 Komorino, Kurume, Fukuoka 830-8555, Japan. s-tanaka@kurume-nct.ac.jp
ACS Applied Materials & Interfaces
|April 2, 2010
Summary
Alkaline chemical treatment of titanium (Ti) with potassium hydroxide (KOH) effectively creates microporous layers, superior to sodium hydroxide (NaOH) treatments. Lithium hydroxide (LiOH) does not yield porous structures.
Area of Science:
- Materials Science
- Surface Chemistry
- Electrochemistry
Background:
- Microporous layers on titanium (Ti) are crucial for various applications.
- Understanding their formation mechanism is key to optimizing properties.
Purpose of the Study:
- To investigate the formation and properties of microporous titanium layers.
- To elucidate the role of alkaline cation species in the chemical treatment process.
Main Methods:
- Electrochemical techniques
- In situ resistometry
- Scanning Electron Microscopy (SEM)
- Grazing-Incident X-ray Diffraction (GIXRD)
- Glow Discharge Optical Emission Spectroscopy (GD-OES)
Main Results:
- Potassium hydroxide (KOH) solutions are most effective for creating microporosity, surpassing sodium hydroxide (NaOH).
- Lithium hydroxide (LiOH) solutions form a compact passive layer, not microporous structures.
- Treatment time positively correlates with the degree of microporosity.
- Hydrogen absorption and dissolution of the near-surface layer contribute to micropore formation.
Conclusions:
- The cation type significantly influences the formation of microporous titanium.
- KOH treatment offers superior results for generating microporous Ti surfaces compared to NaOH and LiOH.
- The process involves a complex interplay of corrosion, hydrogen absorption, and layer dissolution.
