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

Diserahkan: 13 Ogos 2008 / Diterima: 30 Disember 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

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*Pengarang untuk surat-menyurat; email: aoalaba@yahoo.com