Corrosion behaviors of bulk amorphous Fe41Co7Cr15 Mo14C15B6Y2 alloy in NaOH solution

The electrochemical corrosion behaviors of bulk amorphous Fe41Co7Cr15 Mo14C15B6Y2 alloy was investigated in 0.5, 1, 2, 4 mol/L NaOH solutions by potentiodynamic polarization experiments and electrochemical impedance spectroscopy (EIS). The results of potentiodynamic polarization experiment show that the amorphous Fe41Co7Cr15 Mo14C15B6Y2 alloy has excellent corrosion resistance in different concentration of NaOH solutions and its anodic reaction has a passive character. With the concentration of the NaOH solutions increasing, the corrosion resistance of the amorphous alloy decreases. EIS experimental results show that the Nyquist figures of amorphous alloy in different concentration solutions are composed of one single semi-circle in the state of open circuit potential. With the concentration of the NaOH solutions increasing, the semi-circle changed smaller and smaller. It demonstrates that the corrosion resistance of bulk amorphous Fe41Co7Cr15 Mo14C15B6Y2 alloy changed weaker and weaker. This result is accord with that of potentiodynamic polarization.