MAGNESIUM DEACTIVATING AGENT AND METHOD FOR PREPARING A MAGNESIUM-ALLOY USING THE MAGNESIUM DEACTIVATING AGENT

摘要

The present invention provides a magnesium deactivating agent to be added for improving the flame retardancy and corrosion resistance of magnesium and a magnesium alloy, and more particularly, a magnesium deactivating agent which forms a stable protective film on the surface of magnesium by simply being added into most types of molten magnesium alloy, thus enabling melting and casting in air or a general inert atmosphere, thereby preventing the spontaneous ignition of a chip by significantly improving ignition resistance, and also improving the corrosion resistance and mechanical properties of an alloy. The magnesium deactivating agent according to the present invention is characterized by comprising 60 wt% to 41.6 wt% of Ca, 6 wt% to 45 wt% of Y, and Mg as the remainder, along with other inevitable impurities, wherein the contents of Ca and Y in the magnesium deactivating agent follow the mathematical equation: Y ≤ 64.3 - 1.4 Ca (wt %).