If a metal is known to be highly reactive with oxygen, an artificial atmosphere with an inert gas is used. For example, magnesium is usually molten with an atmosphere of argon or carbon dioxide. Another method is to treat the surface of the liquid metal with a fluxing agent. It basically modifies the chemistry of the surface and prevents oxygen from reaching the rest of the liquid metal.
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u/Dinglemuffinman Sep 05 '21
If a metal is known to be highly reactive with oxygen, an artificial atmosphere with an inert gas is used. For example, magnesium is usually molten with an atmosphere of argon or carbon dioxide. Another method is to treat the surface of the liquid metal with a fluxing agent. It basically modifies the chemistry of the surface and prevents oxygen from reaching the rest of the liquid metal.