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A Comprehensive Study of Aluminum Anodization in Transition Modes
Ilia Rozenblium1, Yuliy Yuferov1, Konstantin Borodianskiy1
1Department of Chemical Engineering, Ariel University, Ariel 40700, Israel.
Large-area hard anodization (HA) and ultrahard anodization (UHA) were studied. Pre-UHA modes enable fast growth of thick, uniform nanoporous alumina coatings up to 235 µm in 12 hours.
Area of Science:
- Materials Science
- Electrochemistry
- Surface Engineering
Background:
- Anodization offers tunable nanoporosity and thickness for alumina coatings.
- Large-area fabrication presents unique challenges for hard anodization (HA) and ultrahard anodization (UHA).
Purpose of the Study:
- Investigate the phenomena and challenges of UHA and the transition from HA on large-area samples.
- Determine optimal conditions for achieving uniform, thick nanoporous alumina coatings via pre-UHA modes.
Main Methods:
- Linear-sweep voltammetry was employed to study UHA and HA transitions.
- Systematic variation of temperature (0-15 °C) and processing time (1-12 h) in 0.3 M oxalic acid.
- Evaluation of coating uniformity and thickness.
Main Results:
- Ultrahard anodization (UHA) alone results in non-uniform large-area coatings.
- Pre-UHA modes are crucial for achieving uniform, thick coatings.
- Fast growth of nanoporous alumina up to 235 ± 4 µm was achieved within 12 hours.
Conclusions:
- Pre-UHA modes are essential for fabricating uniform, thick large-area alumina coatings.
- This method allows for rapid deposition of substantial nanoporous alumina layers.
- The findings provide a pathway for efficient large-area nanoporous alumina production.
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