Ag replacing Mg can improve the glass-forming ability of Mg75Ni15Gd10, and its preparation size increases from 3 mm up to 7 mm of Mg69Ni15Gd10Ag6. The Ag addition can improve the density of corrosion products in alkali solution, reduce the passivation current density, improve the forming speed and the stability of passive film and enhance the electrochemical reaction charge transfer resistance. The corrosion rate of Mg75Ni15Gd10 in NaCl solution of 0.1 mol/L descended by 62%. After 90 cycles, the capacity retention rate can be enhanced to 75% from 55% of Mg75Ni15Gd10.