Figure 5.
Variation of the average porosity of nanostructured aluminum oxide films anodized in oxalic acid as a function of the
concentration and temperature of the electrolyte and the voltage
For samples synthesized at 25 °C in the presence of 0.3 M oxalic acid electrolyte during the anodizing process, a decrease
in the average porosity was observed with increasing anode voltage, and a small change in porosity was observed at 5 and 15 ºC.
In the anodization process, the reverse of the above results was observed when the electrolyte concentration was 1 M, ie the
average porosity increased significantly with increasing anode voltage at electrolyte temperatures of 10 and 15 ºC.
Conclusions.
In this work, anodic aluminum oxide nanostructured coatings were synthesized and characterized from a
commercial aluminum alloy by varying the oxalic acid concentration, temperature, and anodization voltage.
The obtained AAO films presented short-range pore arrangements that changed with the concentration, temperature and
synthesis voltage; pore diameters and interpore distances which varied only with anodizing voltage; thicknesses that changed
significantly with concentration, temperature and voltage, and porosities that varied predominantly with voltage and electrolyte
temperature. The key role of voltage on pore dimension when oxalic acid is used as electrolyte has been demonstrated.
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