Metallic glasses have emerged as promising biodegradable materials due to their excellent corrosion resistance properties. However, processing constraints for achieving desired section thickness have limited their real world applications. This study involves the development of partially amorphous bio-compatible and bio-degradable Mg66Zn30Ca4 and Mg60Zn35Ca5 alloys with adequate section thickness for bio-medical components. The corrosion rates of these alloys are analyzed through in-vitro corrosion studies. The combined contributions of the amorphous structure and alloying elements have been used to explain their corrosion behaviors. © 2015 Elsevier Ltd.