Electrochemical Behavior of Bulk Amorphous Steel Fe55 M2 Cr12 Mo10 B6 C13 Y2 (M=Ni, Cu, Nb) Original Research Article

Fe55 Ni2 Cr12 Mo10 B6 C13 Y2, Fe55 Cu2 Cr12 Mo10 B6 C13 Y2 and Fe55 Nb2 Cr12 Mo10 B6 C13 Y2 alloys with diameter of 4 mm were produced by copper mold casting. The effect of alloying additions (Ni, Cu or Nb) on corrosion resistance of Fe55 Nb2 Cr12 Mo10 B6 C13 Y2, Fe55 Ni2 Cr12 Mo10 B6 C13 Y2 and Fe55 Cu2 Cr12 Mo10 B6 C13 Y2 alloys was studied by polarization curves and electrochemical impedance spectroscopy (EIS). The results show that Fe55 Ni2 Cr12 Mo10 B6 C13 Y2 and Fe55 Cu2 Cr12 Mo10 B6 C13 Y2 alloys can be cast to form bulk metallic glasses. Fe55 Ni2 Cr12 Mo10 B6 C13 Y2 and Fe55 Cu2 Cr12 Mo10 B6 C13 Y2 amorphous alloys with passive potential about 1 500 mV exhibit good corrosion resistance in NaCl solution of 5% and 1 mol/L HCl solution. The passive current density of the alloy with Ni addition is lower than that of other alloys. EIS results only show one impedance element. Amorphous alloy Fe55 Ni2 Cr12 Mo10 B6 C13 Y2 with larger charge transfer reaction resistance indicates good corrosion resistance.