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Corrosion Special Topical Papers

Composition of Passive Film

It has been well established that passivity is caused by the formation of a compact ultra-thin surface oxide film - the passive film. The corrosion resistance of stainless steels under service conditions is essentially determined by the stability of such a passive film, which is further determined by the composition, thickness and structure. The relationship between the corrosion resistance, passive film property and alloy composition is illustrated in the following Figure.

Fig.5 The relationship between the corrosion resistance of stainless steels, passive film property and alloy composition.
 

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