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Thermotreatment and Chemical Resistance of Porous Alumina Membrane Prepared by Anodic Oxidation

Chang-Woo Lee Hyun-Seop Kang¹ Yoon-Ho Chang¹ Yeong-Min Hahm^†

Dept. of Chem. Eng., College of Eng., Dankook Univ., Seoul 140-714, Korea ¹School of Chemical, Polymer & Biological Eng., In-Ha Univ., Incheon 402-751, Korea

Korean Journal of Chemical Engineering, May 2000, 17(3), 266-272(7), 10.1007/BF02699038

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Abstract

Porous alumina membranes were prepared by anodic oxidation of aluminum in an aqueous solution of oxalic acid. The thermal and chemical stabilities of porous alumina membranes were investigated by thermal analysis and corrosion test. Alumina membranes prepared in oxalic electrolyte had fairly good thermal stability, but they reacted with boiling water to from boehmite, which blocked pores on the surface of the membrane. For acid and alkali resistance, the membranes were estimated to have chemical stability in aqueous acidic and alkaline solution at 1 < pH < 12. On the other hand, pore size and its distribution were not changed at the time of thermal treatment. Polycrystalline alumina membrane obtained by thermal treatment for 3 h at 900℃ could suppress corrosion reaction and enhance their resistance in acid and alkaline solution.

Keywords

Anodic Oxidation Oxallic Acid Amorphous Alumina Membrane Boehmite Polycrystalline Alumina Membrane Corrosion Resistance Acid and Alkali Resistance

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