The corrosion properties of magnesium alloys strongly depend on the alloy composition and impurities. Heavy elements like nickel, and iron have low solubility in solid magnesium. The dissolved elements in molten magnesium precipitate out on solidification and form intermetallic particles that are the cause of corrosion. Iron content should be kept below the standards specified by ASTM B94/94 using aluminium and manganese. Manganese forms intermetallic particles with iron and aluminium thereby lowering the solubility of iron, and these particles are cathodic compared to magnesium matrix. No...