Amorphous Fe±M±B (M¸Zr, Nb) based alloys with nanometer-sized crystallites have attracted attention due to their magnetic properties. Although corrosion resistance is a desirable property in such alloys, no study concerning this aspect has been reported. The eect of metalloid content and partial crystallization on corrosion resistance of Fe±M±B (M¸Zr, Nb) amorphous alloys, Fe 84 Nb 7 B 9 , Fe 84 Zr 7 B 9 and Fe 83 Zr 3X5 Nb 3X5 B 9 Cu 1 , was investigated. Corrosion resistance measurements were carried out by mass loss, potentiodynamic polarization, and thermogravimetric mass gain measurements. The partial crystallization of the amorphous alloy results in a decrease of the corrosion resistance for all the compositions analyzed. We also observed a greater corrosion resistance when Nb was present in comparison to the case when Zr was present. These results are an eect of the super®cial passive ®lm protector formed.

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