Corrosion Behaviors of Bulk Amorphous Fe41Co7Cr15Mo14C15B6Y2

Abstract:

Corrosion behaviors of bulk amorphous Fe41Co7Cr15Mo14C15B6Y2 alloy in 0.5, 1, 2, 4 mol/L HCl solutions were studied by potentiodynamic polarization experiments and electrochemical impedance spectroscopy (EIS). Moreover, the corrosion behaviors of amorphous alloy and stainless steel were compared in 1 mol/L HCl solution. The results of potentiodynamic polarization experiment show that the amorphous Fe41Co7Cr15Mo14C15B6Y2 alloy has excellent corrosion resistance in different concentration of HCl solutions and its anodic reaction has a passive character. With the concentration of the HCl solutions increasing, the corrosion resistance of the amorphous alloy decreases. The results of potentiodynamic polarization experiments in 1 mol/L HCl solution show that the corrosion potential of the amorphous alloy is higher and the corrosion current density is lower than those of stainless steel. EIS experimental results show that the Nyquist figures of amorphous alloy and stainless steel are both composed of one single semi-circle in the state of open circuit potential. But the amorphous alloy has a higher charge transfer reaction resistance than the stainless steel. This result is accord with that of potentiodynamic polarization. The present results demonstrate that the corrosion resistance of bulk amorphous Fe41Co7Cr15Mo14C15B6Y2 alloy is much better than stainless steel.