Mg-Ni-RE块体非晶合金的制备及稳定性能

Study of Preparation and Stabilizability Properties of Mg-Based Amorphous Alloy

摘要:

Ag元素替代部分Mg可以改善Mg75Ni15Gd10的非晶形成能力，制备尺寸由3 mm提高到Mg69Ni15Gd10Ag6的7 mm。Ag的添加可提高非晶在盐溶液中腐蚀产物的致密性，使腐蚀电位正移，腐蚀电流降低，提高电化学反应电荷转移电阻，使金属基体腐蚀溶解反应变得困难，使非晶合金Mg75Ni15Gd10在0.1 mol/L NaCl溶液中的腐蚀速率下降62%。同时，Ag的添加可以使非晶合金Mg75Ni15Gd10在90次充/放电后的容量保持率由55%提高到75%。

Abstract:

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.