Due to their low corrosion potential, magnesium (Mg) and zinc (Zn) are prone to dissolution in aqueous solution containing chloride ion electrolytes [1] and [2]. This fact has attracted great interest to exploit these corrodible metals for possible utilisation in fabrication of biodegradable medical implants such as screws, pins and stents [2] and [3]. Early interest towards Zn initiated after the published work on Mg–Zn–Ca bulk metallic glasses (with about 50 wt.% of Zn contents) that showed significant reduction in hydrogen gas evolution during in vitro and in vivo degradation [4]. On the other hand, the extensive studies on Mg and its alloys have not yet arrived at a solution to reduce the rapid degradation rate of these alloys that limits their practical applications as biodegradable implants [5]. Therefore, Zn based alloys are recently viewed as attractive new biodegradable metals [6] and [7].