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Vol.36, No.9, 1497 ~ 1506, 1998

Title

Relationship Between Formation Temperature and Corrosion Resistance of Fe2O3-TiO2 Artificial Passive Film

김현수 , 윤재홍 , 허성강 , 삼본극구 杉本克久 Hyun Soo Kim , Jae Hong Yoon , Sung Gang Hur , Katsuhisa Sugimoto

Abstract

Fe₂O₃-TiO₂artificial passive films were formed at formation temperatures of 200∼300℃ by low pressure MOCVD technique. The relationship between formation temperature and corrosion of the Fe₂O₃-TiO₂films was examined in acid solutions. Fe₂O₃-TiO₂ films deposited above 300℃ were crystalline and the films deposited below 250℃ were amorphous. The dissolution rate of the Fe₂O₃-TiO₂films deposited at 200 and 250℃ decreased with increasing the formation temperature in 5 M-HCl, but the films deposited at 300 and 350℃ hardly dissolved in the solution. The films deposited at 200 and 250℃ easily dissolved at cathodic potentials in 1 M H₂SO₄ and HCl owing to the selective reduction of iron oxide components in the films. But, the selective reduction in the films deposited at 300 and 350℃ was suppressed. The Fe₂O₃-TiO₂ films deposited above 300℃ have higher corrosion resistance than that of the films deposited below 250℃, because the former have high crystallinity and contain high chemical resistant oxides.

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