What specific ionic cleanliness test should I have completed? I'm told
there are several methods, with each giving different results.
Thanks for all the feedback up to this point!
Jim
Original Message:
-----------------
From: Karen Tellefsen [log in to unmask]
Date: Tue, 10 Mar 2009 07:43:29 -0500
To: [log in to unmask]
Subject: Re: [TN] Wrong flux used
Yuck!
The flux wicked up the wires, those wires will fail. If the wires can be
replaced, you may be able to salvage the rest of the boards if you wash
them very thoroughly with hot DI water. A prewash with saponifier wouldn't
hurt. After washing, you will need to ensure that all the flux was
removed by ionic cleaniless measurements or extraction and IC.
Good luck
Karen Tellefsen - Electrical Testing
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Jim West
<[log in to unmask]
M> To
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Subject
03/09/2009 06:46 [TN] Wrong flux used
PM
Please respond to
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; Please respond
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Jim West
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M>
During selective soldering, our operator used an IA flux (superior flux
75), which we normally use to dress up the soldering nozzle to create a
smooth flow of solder. The flux was applied by a spray fluxer. The
operator used the wrong bottle when reloading the spray fluxer.
We ran the boards through a wash system hoping to remove the IA flux.
The soldering operation involves discrete wires and I would think that the
flux would wick up under the wire insulation and not be reachable for
cleaning.
My questions are:
If the flux has wicked up under the wire insulator and can not be reached
by cleaning, will this type of flux
cause issues with the copper wire?
Will cleaning the boards be enough to say that no harm will be done, or
will this flux cause latent issues due to it's aggressiveness? (other
components were touched by this flux, i.e. SMT ceramic capacitors,
resistors)
Flux information
Superior soft soldering flux:
"The inorganic acid (IA) zinc chloride fluxes, commonly referred to as
"acid fluxes," are used for industrial soft soldering applications with
tin/lead, tin/silver, and other solder combinations. These fluxes typically
contain a combination of zinc chloride, hydrochloric acid, and ammonium
chloride and are used for soldering stainless steels, brass, copper, and
other metals."
Thanks,
Jim
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