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J. Korean Ceram. Soc. > Volume 48(5); 2011 > Article
Journal of the Korean Ceramic Society 2011;48(5): 439.
doi: https://doi.org/10.4191/kcers.2011.48.5.439
에어로졸 증착법에 의한 YSZ 코팅된 AA1050 알루미늄 합금의 전기화학적 부식 특성
유현삼, 임태섭, 류정호1, 박동수1, 홍성현
서울대학교 재료공학부
1재료연구소 기능세라믹연구그룹
Electrochemical Corrosion Properties of YSZ Coated AA1050 Aluminium Alloys Prepared by Aerosol Deposition
Hyun-Sam Ryu, Tae-Seop Lim, Jung-Ho Ryu1, Dong-Soo Park1, Seong-Hyeon Hong
WCU Hybrid Materials Program, Department of Materials Science and Engineering and Center for Iron and Steel Research, Seoul National University
1Functional Ceramics Research Group, Korea Institute of Materials Science (KIMS)
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.
Key words: AA1050 aluminium alloy, Aerosol deposition, Corrosion property, NaCl, $H_2SO_4$
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