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September 2006

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Subject:
From:
"Dehoyos, Ramon" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Dehoyos, Ramon
Date:
Thu, 28 Sep 2006 10:36:38 -0400
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        Of the many possible ways to refurbish the solder balls, Steve's suggestion sounds very doable, simple and effective.
        Ramon




-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Creswick, Steven
Sent: Thursday, September 28, 2006 6:02 AM
To: [log in to unmask]
Subject: Re: [TN] High Pb part prep

Wayne,

Possibly you mis-interpreted my suggestion.  I did not mean to imply that you should reflow the component, but merely bring the flux and component up to a temperature at which the flux begins to activate.  I have accomplished this at 125-150°C before - without pre-reflowing anything...  Since they are high temp balls, there should be a plethora of fluxes available [aqueous or rosin] that should work for you.

Steve

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Wayne Thayer
Sent: Wednesday, September 27, 2006 3:19 PM
To: [log in to unmask]
Subject: Re: [TN] High Pb part prep

Thanks for everyone's input.  Reflowing them sounds like a good idea, but I know its always best to try and limit time at high temperatures for the package and for intermetallic growth.  I was hoping for some solution like a quick citric acid dip, which does a great job on copper alloys.  Another solution which works on several metals is placing the unit in an reducing environment for awhile.  Right now the retort I use for that is unavailable.  I guess I could try the silver reducing trick as well:  Baking soda, warm water, and aluminum foil:  The oxygen wants to attack the aluminum foil so badly that it reduces the silver oxide to do it.

Wayne

>>> [log in to unmask] 9/27/2006 6:20:49 am >>>
Wayne,

I know this likely violates someones rules of sensitivity, but can you just place the ball-side of your BGAs into a shallow petrie dish of your favorite [easy to clean] flux, place it on a hot-plate to bring it up to its activation temperature, then remove and immediately clean the BGAs and subsequently use them?

10's of parts - not a problem.  100's of parts - more problematic...

Steve

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Wayne Thayer
Sent: den 27 september 2006 00:52
To: [log in to unmask]
Subject: [TN] High Pb part prep

I have some older 90/10 Pb/Sn CBGA parts which show a considerable amount of oxidation on the balls.  What's the best way to clean them prior to reflowing them?

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