Polarization Studies of Zr-Based Bulk Metallic Glasses for Electrochemical Machining
Polarization Studies of Zr-Based Bulk Metallic Glasses for Electrochemical Machining
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DOI：
10.1149/2.092404jes
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发表时间：
2014-01-01
影响因子：
3.9
通讯作者：
Eckert, J.
中科院分区：
文献类型：
--
作者：
Gebert, A.;Gostin, P. F.;Eckert, J.
对大块玻璃形成合金 Zr59Ti3Cu20Al10Ni8、Zr57Cu15.4Al10Ni12.6Nb5 和 Zr35Cu30Al10Ni3 在 250 g/L NaNO3 溶液（电化学（微）加工的标准电解质）中的阳极反应性进行了基本分析。所有合金在较宽的电位范围内均表现出稳定的钝化性。在相对于 SCE（饱和甘汞电极）的电位 >2 V 时，会发生钝态的急剧击穿和主动溶解。通过控制电解液流量，可以提高跨钝反应速率。从跨被动状态的重新钝化不是自发的——它需要更宽的电势或时间窗口。将讨论合金成分和结构状态的影响以及对加工过程的影响。 (C) 2014 年电化学会。版权所有。
The bulk glass-forming alloys Zr59Ti3Cu20Al10Ni8, Zr57Cu15.4Al10Ni12.6Nb5 and Zr35Cu30Al10Ni3 were fundamentally analyzed regarding their anodic reactivity in 250 g/L NaNO3 solution - a standard electrolyte for electrochemical (micro)machining. All alloys exhibited stable passivity in a wide potential range. At potentials >2 V vs. SCE (saturated calomel electrode) a sharp breakdown of the passive state and active dissolution occur. By controlled electrolyte flow the transpassive reaction rate can be enhanced. Re-passivation from the transpassive state is not spontaneous - it requires a wider potential or time window. The influence of alloy composition and structural state will be discussed as well as consequences for the machining process. (C) 2014 The Electrochemical Society. All rights reserved.