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June 2003

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Subject:
From:
Rudy Sedlak <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 24 Jun 2003 19:58:10 EDT
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Effectively, a flux makes the oxides on the metal surface "go away", and
reveal bare metal, which the solder can bond to.

There really is two main ways to make oxides "go away", either reduce them to
metal, or dissolve them.

The rosin, and other, acids, which are in fluxes form salts with the metal in
the oxide, and either dissolve the salt in the flux fluid, or cause it to
ball up, and exit stage left as a sludge.

There are a whole raft of different ingredients in fluxes, and you choose
flux type, and thus ingredient type, depending on how aggressive you want your
flux, and what sort of residue you can tolerate on the surface after soldering.

This much is free...and remember, with free advice, it is often not worth
what you paid for it...

Rudy Sedlak
RD Chemical Company

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