Abstract
The present paper evaluates the corrosion resistance of four new amorphous Fe-Cr-based alloys containing Mo or Nb, as well as their thermal stability and the effect of their partial crystallization. Ribbons of Fe 68B 20Cr 12, Fe 67.7B 20Cr 12Mo 0,3, Fe 67.7B 20Cr 12Nb 0,3 and Fe 67.7B 20Cr 12Nb 0,15Mo 0,15 alloys were processed by the melt-spinning technique. The crystallization process of the four compositions occurs in a single-stage step with the simultaneous precipitation of fcc-Fe and Fe 3.5 B phases . The addition of Nb and/or Mo leads to an increase in the crystallization temperature, indicating that these elements stabilize the amorphous phase. The results also indicate that the alloy containing both Nb and Mo presented greater uniform corrosion resistance than the alloy containing either one or the other of these elements in NaCl and H 2SO 4 solution.
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