Fe{sub 2}O{sub 3}-Cr{sub 2}O{sub 3} artificial passivation films were formed on Pt substrates by low pressure metal organic chemical vapor deposition technique using iron(III) acetylacetonate [Fe(O{sub 2}C{sub 5}H{sub 7}){sub 3}] and chromium(III) acetylacetonate [Cr(O{sub 2}C{sub 5}H{sub 7}){sub 3}] as precursors at substrate temperatures on 150--350 C. Relationships between the crystal structure, and also the chemical state of constituent elements, and the corrosion resistance were examined on the films in acid solutions. The films deposited above 300 C had crystalline structures, and those deposited below 250 C had amorphous structures. The films deposited above 250 C had a high amount of M-O-type chemical bonds, and those deposited below 200 C had a high amount of M-OH-type chemical bonds. The films deposited above 300 C hardly dissolved in 1.0 M HCl and those deposited below 250 C, however, easily dissolved in the solution. The dissolution rate of the films in the solution increased with decreasing substrate temperature. Passive and transpassive current densities of the films in 1.0 M H{sub 2}SO{sub 4} were dependent on the substrate temperature and increased with decreasing the temperature. When polarized cathodically in 1.0 M H{sub 2}SO{sub 4} and 0.5 M HCl, the films deposited below 250 Cmore » dissolved due to the reduction of the Fe{sub 2}O{sub 3} component in the films. The reduction of Fe{sub 2}O{sub 3} component was, however, suppressed on the films deposited above 300 C. Therefore, with increasing crystallinity and amount of M-O-type chemical bonds, the corrosion resistance of the films increases in HCl and H{sub 2}SO{sub 4} solutions.« less