Abstract
The bulk glass-forming alloys Zr59Ti3Cu20Al10Ni8, Zr57Cu15.4Al10Ni12.6Nb5 and Zr55Cu30Al10Ni5 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.
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