Melting Fluxes and Protective Agents

Due to the tendency of oxidizing and contaminating with non-metallic inclusions the magnesium alloys are cast under the salt cover or in an atmosphere of protective gas mixtures as well as via an introduction of alloying elements. The magnesium casting industry has been trying for many years to find methods and procedures for limiting liquid metal oxidation. Among the most common procedures are chloride containing salts (carnallite) and gases (SF6) and application of SO2. However, SO2 is toxic and very corrosive and SF6 is a greenhouse gas with a very high global warming potential (GWP). This situation forces producers of castings to look for alternative protective gases for the Magnesium melt. Intensive works on the development of alternative mixtures constituting protective atmospheres for magnesium and its alloys are currently under way.

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