Improved corrosion resistance of novel Fe-based amorphous alloys

Abstract

Developing amorphous alloys with good corrosion resistance have attracted wide interests recently. In this work, a series of Fe71−xCrxMo3.5Ni5P10C4B4Si2.5 (x=0, 4, 8, 10, 12, 14at.%) amorphous alloys are fabricated. Thermal stability of this alloy system increases slightly with appropriate Cr content. The corrosion resistance in 3.5wt.% NaCl solution is sensitive to the minor addition of Cr (≤4at.%) whereas higher Cr does not significantly improve the corrosion resistance according to the results of electrochemical measurements, SEM and XPS. These Fe-based amorphous alloys show comparable corrosion resistance with the well-known amorphous steel (Fe48Mo14Cr15Y2C15B6) despite the low Cr and Mo content, making them good candidates as corrosion-resistant coating materials.