Metals as the most popular implant biomaterials played an important role in repairing and replacing bones in recent decades. However, metallic biomaterials, including stainless steels, titanium alloys and nickel-cobalt alloys used have currently some weakness in their bio-compatibility and bio-mechanical compatibility. Magnesium alloy are potential implant materials due to their excellent biocompatibility, good mechanical property and biodegradable. Unfortunately, the high susceptibility of Mg alloys to cor...