Corrosion resistance of Fe sub(2)O sub(3)-Cr sub(2) O sub(3) artificial passive films formed with LP-MOCVD

Fe sub(2)O sub(3)-Cr sub(2)O sub(3) 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 resista...

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Bibliographic Details
Published in:Metals and materials international 2002-04, Vol.8 (2), p.203-209
Main Authors: Kim, Hyun-Soo, Yoon, Jae-Hong, Shin, Kee-Sam, Sugimoto, Katsuhisa
Format: Article
Language:English
Subjects:
Corrosion resistance
Crystal structure
Crystallinity
Deposition
Dissolution
Iron
Low pressure
Reduction
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Summary:Fe sub(2)O sub(3)-Cr sub(2)O sub(3) 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 degree C hardly dissolved in 1.0 M HCl and those deposited below 250 degree 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 H sub(2)SO sub(4), the films deposited below 250 degree C dissolved due to the reduction of the Fe sub(2)O sub(3) component in the films. The reduction of the Fe sub(2)O sub(3) component was, however, suppressed on the films deposited above 300 degree C. Therefore, with increasing crystallinity and the amount of M-O type chemical bonds, the corrosion resistance of the films increases in HCl and H sub(2)SO sub(4) solutions.
ISSN:1598-9623
DOI:10.1007/BF03027019