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 (Department of Chemical Engineering, College of Engineering, Dankook University) ;
  • Lee, Yoong (Department of Chemical Engineering, College of Engineering, Dankook University) ;
  • Kang, Hyun-Seop (School of Chemical, Polymer & Biological Engineering, In-Ha University) ;
  • Chang, Yoon-Ho (School of Chemical, Polymer & Biological Engineering, In-Ha University) ;
  • Hong, Young Ho (Department of Industry & Chemical Engineering, Hye Jeon College) ;
  • Hahm, Yeong-Min (Department of Chemical Engineering, College of Engineering, Dankook University)
  • 이창우 (단국대학교 공과대학 화학공학과) ;
  • 이융 (단국대학교 공과대학 화학공학과) ;
  • 강현섭 (인하대학교 공과대학 화학공학과) ;
  • 장윤호 (인하대학교 공과대학 화학공학과) ;
  • 홍영호 (혜전대학 공업화학과) ;
  • 함영민 (단국대학교 공과대학 화학공학과)
  • Received : 1998.06.23
  • Accepted : 1998.08.18
  • Published : 1998.12.10

Abstract

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.

Acknowledgement

Supported by : 한국과학재단

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