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PURPOSE : A magnesium alloy is provided to control the corrosion-resistance and rigidity characteristic of the magnesium alloy through a post-processing process.CONSTITUTION : A magnesium alloy comprises magnesium and a different kind of element except for the magnesium. An electrical potential difference between a magnesium phase and a phase composed of the element different from the magnesium is 0~0.2V. The magnesium alloy does not include aluminum and a rare-earth family element. The different kind of element is two or more of Ca, Fe, Mn, Co, Ni, Cr, Cu, Cd, Zr, Ag, Au, Pd, Pt, Re, Fe, Zn, Mo, Nb, Ta, Ti, Sr, Si, P, and Se.COPYRIGHT KIPO 2011