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This paper deals with the passivation of ferritic stainless steels (26% Cr) in a 3.5% normalNaCl solution. The passive state was examined by Auger electron spectrometry and electrochemical reduction techniques. From the chemical composition profiles it appears that the passivation of these alloys is characterized by the formation of a thin oxide film and the development of a chromium‐depleted zone in the metallic substrate near the metal‐oxide interface. The composition of the passive film changes continuously with the depth. The number of atoms within a given layer of the film is lower than in the layers of the metallic matrix. The thickness and chemical composition of passive films change with the temperature of the corrosive medium. The study by cathodic reduction shows that molybdenum additions especially affect the properties of the inner layers of the passive film.

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