Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Formation of Anodic Al Oxide Nanofibers on Al3104 Alloy Substrate in Pyrophosphoric Acid

피로인산 전해질에서 양극산화를 통한 알루미늄 3104 합금 나노섬유 산화물 형성

  • Kim, Taewan (Department of Advanced Science and Technology Convergence, Kyungpook National University) ;
  • Lee, Kiyoung (Department of Advanced Science and Technology Convergence, Kyungpook National University)
  • 김태완 (경북대학교미래과학기술융합학과) ;
  • 이기영 (경북대학교미래과학기술융합학과)
  • Received : 2021.02.03
  • Accepted : 2021.02.16
  • Published : 2021.02.28
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Abstract

In this study, we investigated the formation of the metal oxide nanostructure by anodization of aluminum 3104H18 alloy. The anodization was performed in pyrophosphoric acid (H4P2O7) electrolyte. By the control of anodization condition such as concentration of electrolyte, anodization temperature and applied voltage, nanoporous or nanofiber structures were obtained. The optimal anodization condition to form nanofiber structures are 75 wt% of H4P2O7 at 30 V and 20℃. When anodization was performed at over 40 V, nanoporous structures were formed due to accelerated dissolution reaction rate of nanofiber structures or increasing thickness of channel wall.

본 연구에서는 산업에서 많이 이용되는 알루미늄 3104H18 금속을 양극산화하여 다공성 나노구조 및 나노섬유 구조의 알루미늄 산화막을 형성하였다. 양극산화를 위한 전해질은 피로인산(H4P2O7)과 증류수를 혼합하여 사용하였다. 양극산화 진행 시 전해질의 농도, 온도, 인가전압과 같은 다양한 변수를 통해 다공성 알루미늄 산화막과 나노섬유 구조를 형성할 수 있었다. 나노섬유 구조를 형성하기 위해서는 피로인산 전해질 농도가 75 wt%, 인가전압이 30 V, 20℃의 양극산화 온도가 최적 조건임을 밝혀냈다. 인가전압이 40 V 이상이 되었을 때는 산화물의 용출속도의 증가 또는 높아진 전압으로 인한 채널벽의 두께증가로 인하여 다공성 나노구조의 형태가 나타난다는 것을 확인했다. 본 연구를 통하여 전해질의 농도, 인가전압 및 온도에 따른 산화물의 형성 및 용해반응이 평형을 이루었을 때 가장 나노섬유가 잘 형성된 알루미늄 산화막을 형성할 수 있음을 밝혔다.

Keywords

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