Corrosion behavior of Zr–Cu–Ni–Al bulk metallic glasses in chloride medium

Polarization and passivation behavior of three Zr-based BMGs, i.e. Zr 58.3Al 14.6Ni 8.3Cu 18.8, Zr 58Al 16Ni 11Cu 15 and Zr 57.5Al 17.5Ni 13.8Cu 11.3 were investigated in 3% NaCl aqueous solution. Electrochemical investigations were carried out by potentiodynamic polarization method at room temperature. The corroded sample surfaces were examined using scanning electron microscope having energy dispersive spectroscopy (EDS) attachment. The results of the present investigation revealed that Zr 58Al 16Ni 11Cu 15 and Zr 57.5Al 17.5Ni 13.8Cu 11.3 BMGs having relatively larger supercooled liquid region (Δ T x ) and pitting overpotential ( η pit) values exhibit low corrosion current density ( i corr) and corrosion penetration rate (CPR) values.