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Corrosion resistance of Fe2O3-Cr2O3 artificial passive films formed with LP-MOCVD

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Abstract

Fe2O3-Cr2O3 artificial passive films were formed with a low pressure MOCVD technique using iron (III) acetylacetonate and chromium (III) acetylacetonate. The relationships between the crystal structure, the chemical state of the constituent elements, and the corrosion resistance of the films were examined in acid solutions. The films deposited above 300°C hardly dissolved in 1.0 M HCl and those deposited below 250°C, however, easily dissolved in the same solution. The dissolution rate of the films in solution increased with decreasing substrate temperature. When polarized cathodically in 1.0 M H2SO4, the films deposited below 250°C dissolved due to the reduction of the Fe2O3 component in the films. The reduction of the Fe2O3 component was, however, suppressed on the films deposited above 300°C. Therefore, with increasing crystallinity and the amount of M-O type chemical bonds, the corrosion resistance of the films increases in HCl and H2SO4 solutions.

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Authors and Affiliations

  1. Battery Research Group, Korea Electrotechnology Research Institute, 28-1 Seongju-dong, 641-120, Changwon, Korea

    Hyun-Soo Kim

  2. Department of Materials Science and Engineering, Changwon National University, 9 Sarim-dong, 641-773, Changwon, Korea

    Jae-Hong Yoon & Kee-Sam Shin

  3. Department of Metallurgy, Graduate School of Engineering, Tohoku University, 980-8579, Sendai, Japan

    Katsuhisa Sugimoto

Authors
  1. Hyun-Soo Kim
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  2. Jae-Hong Yoon
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  3. Kee-Sam Shin
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  4. Katsuhisa Sugimoto
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Kim, HS., Yoon, JH., Shin, KS. et al. Corrosion resistance of Fe2O3-Cr2O3 artificial passive films formed with LP-MOCVD. Met. Mater. Int. 8, 203–209 (2002). https://doi.org/10.1007/BF03027019

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