Corrosion Resistance of Fe-Based Bulk Amorphous Alloy with Sulfide Inclusion

Corrosion resistance of Fe-based bulk metallic glass with sulfide inclusion was investigated in HCl, H2SO4, NaCl and NaOH solutions at different ambient temperature. The results indicate that Fe-based amorphous alloy generally exhibits more excellent corrosion resistance in alkaline solutions than that in acidic solutions, and presents high spontaneous passivated ability and evident passivation region in all solutions. Electrochemical impedance spectroscopy results display that all of the Nyquist curves are composed of just a single capacitive loop, and the electrode reaction is mainly controlled by the electrode potential. The mass loss exceeds 0.67 mg/cm2 in 0.5 M H2SO4 solution, and rapider than that in another solutions. With increase of ambient temperature, the corrosion resistance decreases in all solutions. No pitting corrosion occurs in acidic solutions, though the inclusion particle is dissolved firstly. Seemly, some pit can be formed in NaCl solution, when ambient temperature exceeds 60 °C.