Borax in metallurgy

Borax in metallurgy

 
Borax Decahydrate has the ability to dissolve metal oxides and is exploited in the recovery of metals such as brass, copper, lead and zinc from scrap or smelting slag. In Iron metallurgy, Borax Decahydrate is used as a flux to prevent oxidation at the surface of the molten iron. In other metal working processes like welding, brazing, and soldering, Borax is used to cover the metal surfaces. This prevents any oxidation occuring by excuding air and moisture contact. It also can be used as a cleaning agent.
 
A mixture of borax and ammonium chloride is used as a flux when welding iron and steel. It lowers the melting point of the unwanted iron oxide, scale, allowing it to run off. Borax is also used mixed with water as a flux when soldering jewellery metals such as gold or silver. It allows the molten solder to flow evenly over the joint in question. Borax is also a good flux for "pre-tinning" tungsten with zinc – making the tungsten soft-solderable. Borax is often used as a flux for forge welding.
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