• Title, Summary, Keyword: Anodic Axidation

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Effect of Additives on Preparation of Porous Alumina Membrane by Anodic Oxidation in Sulfuric Acid (황산전해조에서 양극산화에 의한 다공성 알루미나 막의 제조시 첨가제의 영향)

  • Lee, Chang-Woo;Lee, Yoong;Kang, Hyun-Seop;Chang, Yoon-Ho;Hong, Young Ho;Hahm, Yeong-Min
    • Applied Chemistry for Engineering
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    • v.9 no.7
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    • pp.1030-1035
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    • 1998
  • The porous alumina membrane was prepared from aluminum metal(99.8%) by anodic oxidation using DC power supply of constant current mode in an aqueous solution of sulfuric acid. To prevent the chemical dissolution of alumina membrane, $Al_2(SO_4)_3$, $AlPO_4$ and $Al(NO_3)_3$ which could be considered to supply $Al^{3+}$ ions were added to electrolyte solution at a reaction temperature of $20^{\circ}C$ and cumulative charge of $150C/cm^2$. Effects of these additives on the formation of porous alumina membrane were evaluated under various electrolyte concentration(5~20 wt%) and current densities($10{\sim}50mA/cm^2$). The membrane surfaces which were prepared in electrolyte solution with all the additives except $Al_2(SO_4)_3$ were damaged. However, when $Al_2(SO_4)_3$ was added to the $H_2SO_4$ solution, an uniform surface of porous alumina was obtained. Also, it was shown that the pore size of membrane was nearly independent on the quantity of $Al_2(SO_4)_3$ added at same electrolyte concentration and current density.

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