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A High-Performance Corrosion-Resistant Iron-Based Amorphous Metal - The Effects of Composition, Structure and Environment on Corrosion Resistance

  • Joseph Collin Farmer (a1), J. Haslam (a2), D. Day (a3), T. Lian (a4), C. Saw (a5), P. Hailey (a6), J-S. Choi (a7), R. Rebak (a8), N. Yang (a9), R. Bayles (a10), L. Aprigliano (a11), J. Payer (a12), J. Perepezko (a13), K. Hildal (a14), E. Lavernia, L. Ajdelsztajn, D. Branagan and B. Beardsley...

Abstract

The passive film stability of several Fe-based amorphous metal formulations have been found to be comparable to that of high-performance Ni-based alloys, and superior to that of stainless steels, based on electrochemical measurements of the passive film breakdown potential and general corrosion rates. Chromium (Cr), molybdenum (Mo) and tungsten (W) provide corrosion resistance; boron (B) enables glass formation; and rare earths such as yttrium (Y) lower critical cooling rate (CCR). The high boron content of this particular amorphous metal also makes it an effective neutron absorber, and suitable for criticality control applications, as discussed in companion publications. Corrosion data for SAM2X5 (Fe49.7Cr17.7Mn1.9Mo7.4W1.6B15.2C3.8Si2.4) is discussed here.

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