Production of magnesium alloys resistant to oxidation

Magnesium alloys are inherently susceptible to oxidation due to the reactive nature of magnesium, which readily forms a thin layer of magnesium oxide (MgO) on the surface when exposed to air. However, various alloying strategies and surface treatment techniques have been developed to enhance the oxidation resistance of magnesium alloys, making them more suitable for applications where they are exposed to elevated temperatures or corrosive environments. One approach to improving the oxidation resistance of magnesium alloys is through the addition of specific alloying elements, such as aluminum (Al), zinc (Zn), and rare earth metals (REMs). The inclusion of these elements can help in the formation of stable, protective oxide layers on the surface of the magnesium, which act as a barrier against further oxidation. For example, adding aluminum to magnesium alloys can promote the formation of a dense and adherent alumina (Al2O3) layer, which provides excellent protection against high-temperature oxidation. Furthermore, the incorporation of rare earth metals, such as cerium (Ce), lanthanum (La), and yttrium (Y), can also enhance the oxidation resistance of magnesium alloys by refining the grain structure, modifying the oxide layer composition, and promoting the formation of a more stable and protective scale, effectively slowing down the oxidation process. Ongoing research and development in the field of magnesium alloy design continue to explore new strategies for improving the oxidation resistance of these lightweight, high-performance materials, expanding their applications in industries such as automotive, aerospace, and electronics.