Journal of Power System Engineering (동력기계공학회지)

The Korean Society for Power System Engineering (한국동력기계공학회)
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Corrosion Behavior of Casting Aluminum Alloys in H2SO4 Solution

H2SO4 수용액에서의 주조용 알루미늄 합금들의 부식거동

  • Woo, Sang-Hyun (Department of Material System Engineering, Graduate School, Pukyong University) ;
  • Son, Young-Jin (AMC Co., Ltd.) ;
  • Lee, Byung-Woo (Department of Material System Engineering, Graduate School, Pukyong University)
  • 우상현 (부경대학교 대학원 신소재시스템공학과) ;
  • 손영진 ((주) 에이엠씨) ;
  • 이병우 (부경대학교 대학원 신소재시스템공학과)
  • Received : 2015.11.04
  • Accepted : 2016.04.27
  • Published : 2016.06.30
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Abstract

The corrosion behavior of aluminum alloys in the $H_2SO_4$ solution was investigated based on potentiodynamic techniques. Electrochemical properties, such as corrosion potential($E_c$), passive potential($E_p$), corrosion current density($I_c$), corrosion rate(mpy), of Al-Mg-Si, Al-Cu-Si and Al-Si alloys were characterized at room temperature. Passive aluminum oxide film, which including $Al_2(SO_4)_3$ and $3Al_2O_34SO_38H_2O$, were uniformly formed on the surface via the reaction of Al with $SO{_3}^{2-}$ or $SO{_4}^{2-}$ ions in the $H_2SO_4$ solution and the dependence of the corrosion behavior on the alloying element was discussed. The selective leaching of alloy element increased with increasing Cu content in the aluminum alloys.

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