What is flux ? What is its use?

Asked by sureshkumar kumar | 27th Jul, 2013, 03:59: PM

Expert Answer:

In metallurgy, a flux is a chemical cleaning agent, flowing agent, or purifying agent. Flux may have more than one function at a time. It is used in both extractive metallurgy and metal joining.

 Iron ore is  used as a flux in the smelting of copper.

As a cleaning agent, flux facilitates soldering, and welding by removing oxidation from the metals to be joined. eg- ammonium chloride or rosin  for soldering tin; HCl and ZnCl2 for soldering galvanised Iron.

 
Molten flux also serves as a heat transfer medium, facilitating heating of the joint by the soldering tool or molten solder.

Answered by  | 27th Jul, 2013, 11:18: PM

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