Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Electrochemical Corrosion Properties of YSZ Coated AA1050 Aluminium Alloys Prepared by Aerosol Deposition

에어로졸 증착법에 의한 YSZ 코팅된 AA1050 알루미늄 합금의 전기화학적 부식 특성

  • Ryu, Hyun-Sam (WCU Hybrid Materials Program, Department of Materials Science and Engineering and Center for Iron and Steel Research, Seoul National University) ;
  • Lim, Tae-Seop (WCU Hybrid Materials Program, Department of Materials Science and Engineering and Center for Iron and Steel Research, Seoul National University) ;
  • Ryu, Jung-Ho (Functional Ceramics Research Group, Korea Institute of Materials Science (KIMS)) ;
  • Park, Dong-Soo (Functional Ceramics Research Group, Korea Institute of Materials Science (KIMS)) ;
  • Hong, Seong-Hyeon (WCU Hybrid Materials Program, Department of Materials Science and Engineering and Center for Iron and Steel Research, Seoul National University)
  • 유현삼 (서울대학교 재료공학부) ;
  • 임태섭 (서울대학교 재료공학부) ;
  • 류정호 (재료연구소 기능세라믹연구그룹) ;
  • 박동수 (재료연구소 기능세라믹연구그룹) ;
  • 홍성현 (서울대학교 재료공학부)
  • Received : 2011.07.25
  • Accepted : 2011.08.16
  • Published : 2011.09.30
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Abstract

Yttria stabilized zirconia (YSZ) coating was formed on AA1050 Al alloys by aerosol deposition (AD), and its electrochemical corrosion properties were investigated in 3.5 wt% NaCl and 0.5M $H_2SO_4$ solutions. The crack-free, dense, and ~5 ${\mu}m$ thick YSZ coating was successfully obtained by AD. The as-deposited coating was composed of cubic-YSZ nanocrystallites of ~10 nm size. The potentiodynamic test indicated that the YSZ coated Al alloy had much lower corrosion current densities (2 nA/$cm^2$) by comparison to uncoated sample and exhibited a passive behavior in anodic branch. Particularly, a pitting breakdown potential could not be identified in $H_2SO_4$. EIS tests revealed that the impedance of YSZ coated sample was ${\sim}10^6{\Omega}cm^2$ in NaCl and ${\sim}10^7{\Omega}cm^2$ in $H_2SO_4$, which was about 3 or 4 orders of magnitude higher than that of uncoated sample. Consequently, the corrosion resistance of Al alloy had been significantly enhanced by the YSZ coating.

Keywords

References

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