Sains Malaysiana 38(4)(2009): 521–524 

One-Step Anodization of Aluminum at Room Temperature

(Penganodan Aluminium pada Suhu Bilik dengan Satu Langkah)

Alaba O. Araoyinbo*, M.N. Ahmad Fauzi, Srimala Sreekantan, Azizan Aziz

School of Materials and Mineral Resources Engineering

Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia

Received: 13 August 2008 / Accepted: 30 December 2008

ABSTRACT

The formation of nano pores on aluminum at 30^oC- 38^oC, employing a one step anodization technique which does not require removing the oxide layer formed is presented. A 20% phosphoric acid electrolyte (concentration higher than the normal anodization concentration of 5 to 10%) at a cell potential of 60 volts was used. A platinum electrode was used as the cathode electrode while the aluminum substrate as the anode electrode. A dc powered electrochemical cell to provide the required amount of current density (without the use of temperature controlled water bath) suitable or necessary for pore formation at room temperature was employed. The results obtained show that pore formation at room temperature is achievable and the pore diameter ranged between 80-120 nm.

Keywords: Aluminum; electrochemical cell; electrolyte; nano pores

ABSTRAK

Pembentukan nano liang ke atas aluminium pada suhu 30^oC- 38^oC dilakukan dengan menggunakan penganodan satu langkah di mana pembuangan lapisan oksida yang terbentuk tidak diperlukan dilaporkan. 20% elektrolit asid fosforik yang digunakan mempunyai kepekatan tinggi daripada kepekatan penganodan lazim sebanyak 5% hingga 10% pada keupayaan sel 60 volt. Elektrod platinum digunakan sebagai elektrod katod manakala substrat aluminium sebagai elekrod anod dan yang paling utama adalah pengubahsuaian kuasa arus terus sel elektrokimia untuk membekalkan jumlah kuasa yang diperlukan tanpa penggunaan mandian air yang suhu terkawal yang sesuai untuk pembentukan liang pada suhu bilik. Keputusan yang diperolehi menunjukkan pembentukan liang pada suhu bilik boleh dicapai dan julat diameter liang dianggarkan antara 80-120 nm.

Kata kunci: Aluminium; elektrolit; nano liang; sel elektrokimia

REFERENCES

Belwalkar, A., Grasing, E., Geertruyden, W.V., Huang, Z. & Misiolek, W.Z. 2008. Effect of Processing Parameters On Pore Structure and Thickness of Anodic Aluminum Oxide (AAO) Tubular Membranes. Journal of Membrane Science 319: 192-198

Chu, S.Z., Wada, K., Inoue, S. & Todoroki, S. 2003. Fabrication and Characteristics of Nanostructures On Glass by Al Anodization and Electrodeposition. Electrochemical Acta 48: 3147-3153.

De Azevedo, W.M., De Carvalho, D.D., Khoury, H.J., De Vasconcelos, E.A. & Da Silva Jr, E.F. 2004. Spectroscopic Characteristics of Doped Nanoporous Aluminum Oxide. Materials Science and Engineering B 112: 171-174.

Hou, K., Tu, J.P. & Zhang, X.B. 2002. Preparation of Porous Alumina Film On Aluminum Substrate by Anodization In Oxalic Acid. Chinese Chemical Letters 13: 689-692.

Kang, H.J., Kim, D.J., Park, S.J., Yoo, J.B. & Ryu, Y.S. 2007. Controlled Drug Release Using Nanoporous Anodic Aluminum Oxide On Stent. Thin Solid Films 515: 5184-5187.

Li, Z. & Huang, K. 2007. Optical Properties of Alumina Membranes Prepared by Anodic Oxidation Process.  Journal of Luminescence 127: 435-440.

Macak, J.M., Tsuchiya, H., Ghicov, A., Yasuda, K., Hahn, R., Bauer, S. & Schmuki, P. 2008. TiO₂ Nanotubes: Self-Organized Electrochemical Formation, Properties and Applications. Current Opinion In Solid State and Materials Science 11: 3-18.

Su, S.H., Li, C.S., Zhang, F.B. & Yokoyama, M. 2008. Characterization of Anodic Aluminium Oxide Pores Fabricated On Aluminium Templates. Journal of Superlattices and Microstructures 44: 514-519.

Sulka, G.D., Stroobants, S., Moshchalkov, V., Borghs, G. & Celis, J.P. 2002. Synthesis of Well-Ordered Nanopores by Anodizing Aluminum Foils In Sulfuric Acid. Journal of The Electrochemical Society 149: D97-D103.

Sulka, G.D. & Parkoła, K.G. 2007. Temperature Influence On Well-Ordered Nanopore Structures Grown by Anodization of Aluminum In Sulfuric Acid. Electrochimica Acta 52: 1880-1888.

Wang, H. & Wang, H. 2005. Thick and Macroporous Anodic Alumina Membranes For Self-Lubricating Surface Composites. Journal of Applied Surface Science 249: 151-156.

Wang, H., Dai, D. & Wu, X. 2008. Fabrication of Superhydrophobic Surfaces On Aluminum. Journal of Applied Surface Science 254: 5599-5601.

Zhu, X.F., Li, D.D., Song, Y. & Xiao, Y.H. 2005. The Study On Oxygen Bubbles of Anodic Alumina Based On High Purity Aluminum. Journal of Materials Letters 59: 3160-3163.

  *Corresponding author; email: aolaba@yahoo.com