Journal of Power System Engineering (동력기계공학회지)

The Korean Society for Power System Engineering (한국동력기계공학회)
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A Study on the Electrochemical Characteristics of Al-Si Casting Alloys in NaCl Solution

NaCl 수용액에서 Al-Si계 주조용 합금의 전기화학적 특성 연구

  • Woo, Sang-Hyun (Department of Material System Engineering, Graduate School, Pukyung University) ;
  • Son, Young-Jin (Department of Material System Engineering, Graduate School, Pukyung University) ;
  • Lee, Byung-Woo (Department of Material System Engineering, Pukyung University)
  • Received : 2014.07.30
  • Accepted : 2014.10.28
  • Published : 2014.12.31
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Abstract

The electrochemical characteristics of Al-Si casting alloys (Al-10%Si, Al-9%Si, Al-7%Si) in 3.5% NaCl solution at room temperature was studied using potentiodynamic techniques. The electrochemical values of corrosion potential($E_c$), corrosion current density($I_c$) and corrosion rate(mpy) were examined. The Al-Si alloys had several compounds such as $Mg_2Si$, ${\pi}$-$Al_8Si_6Mg_2Fe$ and $Al_2CuMg$ which could affect corrosion resistance significantly. The potentiodynamic polarization curve exhibited typical active behavior in anodic polarization curve. The major corrosion mechansim for the Al-Si alloys were pitting and grain boundary corrosion. As increasing Si and Cu contents, their corrosion resistance was decreased.

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References

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