One of the key ways that selenium impacts magnesium metal is through the formation of protective layers. When selenium is added to magnesium, it can react with the metal to create a layer of magnesium selenide on the surface. This layer can help to protect the magnesium from corrosion and other forms of damage, making it more durable and long-lasting. This is particularly important in industrial applications where magnesium is used in harsh environments or exposed to corrosive substances. By understanding the role of selenium in the formation of these protective layers, researchers can develop new ways to improve the performance of magnesium-based materials.