The anodic polarization characteristics in 1N H2SO4 (25 C) of Fe-8 Wt% Si, Fe-8Al and Fe-5Si-3Al alloys fabricated by conventional processing (ingot metallurgy) and of Fe-8Al fabricated by powder metallurgy were determined. With the exception of the Fe-8Si, the alloys undergo an active-to-passive transition. The passivation behavior is controlled by the aluminum content of the alloys, the aluminum decreasing the passivation potential. Although the appearance of the corrosion attack is different, the anodic polarization characteristics of the Fe-8Al alloy are essentially independent of the method of fabrication (i.e., ingot metallurgy vs powder metallurgy).

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National Association of Corrosion Engineers
1984
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