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What is Flux?

Posted by on 9/21/2019

If you’re part of the electronics manufacturing industry, then you’re probably already familiar with flux.  However, if you’re not and have no idea what we’re talking about, this article is for you! Flux is a commonly used material for several different industries and applications.  Here, we will focus solely on solder flux.



Derived from the Latin word Fluxus, flux means “flow.”  This chemical cleaning, or flowing agent, is also referred to as a purifying agent.  Flux wears many hats because it provides multiple functions at once.  The primary function is to prevent oxidation while joining metals.


Cleaning agents

As a cleaning agent, flux enables soldering by removing oxidation from the metals to be joined.  It then seals out the air to prevent further oxidation from occurring.  The third function of soldering flux is the facilitation of amalgamation to improve wetting characteristics of the liquid solder.



In high-temperature metal joining processes, flux enables the solder to adhere to a clean metal surface.  However, there are several different types of flux.  Choosing the right flux for your job will be dependent on the metals being utilized.  For example, if your soldering stainless steel a solder flux that has a solution of zinc chloride in hydrochloric acid will work best.  Whereas magnesium alloys can be worked with molten acetamide.



Regardless of the variation, flux consists of the four following components:


In other words, flux removes oxidations, aids in heat transfer, cleans and prepares the joint to accept the solder, and promotes even solder flow.


For more information on different types of fluxes and their properties, contact the team at The Waveroom Plus.  Founded in 1990, our company differs from the competition.  Our company will provide the time and attention you may need to complete your application with precision.  Call us today and experience the difference for yourself (603) 437-4651.


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