Problems with laboratory-produced zinc alloys
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When refining zinc-aluminum-magnesium alloys, potassium chloride plus lithium chloride (1.3:1) is used as a molten salt for protection, and melting takes place at 700 degrees Celsius; as a result, the surface of the resulting alloy turns black. A similar phenomenon occurs when zinc is melted alone. I seek help from experts
It is recommended that you change the composition of the molten salt used for protection, and try using ammonium chloride as a protective agent.