A Study on the Improvement of Oxidation and Corrosion Resistance of Stainless Steel by Sol-Gel Ceramic Coating; (I) Synthesis of Zirconia Sol and Fabrication of Its Thin Film

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J. Korean Ceram. Soc. > Volume 31(9); 1994 > Article

Journal of the Korean Ceramic Society 1994;31(9): 1060.

졸-겔 세라믹 코팅에 의한 스테인레스강의 내산화 및 내식성 향상에 관한 연구;(I) 지르코니아 졸의 합성 및 박막의 제조

김병호, 홍권, 신동원

고려대학교 재료공학과

A Study on the Improvement of Oxidation and Corrosion Resistance of Stainless Steel by Sol-Gel Ceramic Coating; (I) Synthesis of Zirconia Sol and Fabrication of Its Thin Film

ABSTRACT

Stable zirconia sol was prepared from zirconium butoxide Zr(OC4O9)4 as a precursor and ethylacetoacetate(EAcAc) or diethylene glycol(DEG) as a chelating agent under ambient agent under ambient atmosphere by Sol-Gel process. The sythesized sol was coated on 304 stainless steel substrate by dip coating, thereafter zirconia film could be obtained by heat-treatment at $600^{circ}C$. The characteristics of coating film were determined by FT-IR, XRD, and ellipsometion peak represented Zr-O-Zr bonding of tetragonal phase was shown at 470cm-1. Crystallization of zirconia gel and film from amorphous state to tetragonal phase started at 40$0^{circ}C$, and then transformed into monoclinic phase around $700^{circ}C$. Zirconia film coated on 304 stainless steel substrate showed relatively low porosity of 16% when it was coated with 0.4M zirconia sol and thereafter heat-treated at 80$0^{circ}C$ and the film was densified continuously up to 90$0^{circ}C$. The zirconia film of 10 nm thick acted as a protective layer against oxidation up to $700^{circ}C$.