[TriEmbed] soldering oxidized pins - QFN part

[Shane Trent]

What about a week acid (vinegar)? Here is an Instructable using salt and
vinegar to clean copper wire. Or you could use a more aggressive flux.

http://www.instructables.com/id/How-to-perfectly-clean-wires-in-minutes/

Shane

On Wed, Jan 27, 2016 at 12:37 PM Glen Smith via TriEmbed <
triembed at triembed.org> wrote:

> After the pencil eraser my next step (if needed) would be a nylon bristle
> or wire wheel in a Dremel tool. I used mine recently to clean up some
> battery contacts damaged by Alkaleak batteries. A light touch would be
> essential, but I'm betting this would rejuvenate the chips pretty quickly,
> with no need for caustics.
>
> Glen
>
> On Wed, Jan 27, 2016 at 11:49 AM Mauricio Tavares via TriEmbed <
> triembed at triembed.org> wrote:
>
>> On Wed, Jan 27, 2016 at 11:21 AM, Jeffrey Crews via TriEmbed
>> <triembed at triembed.org> wrote:
>> > It might be worth it for someone at Tri or Splat to score some "crocus
>> > cloth." It's like ultra-fine emery (actually red rouge-impregnated stiff
>> > cloth) usually used for polishing fine/soft metals like gold.
>> >
>> > I used to have some and it was awesome because it didn't damage
>> anything or
>> > remove gold or other platings.
>> >
>> > Come to think of it, I'll get some.
>> >
>> > JSC
>> >
>> > On Wed, Jan 27, 2016 at 11:12 AM, Carl Nobile via TriEmbed
>> > <triembed at triembed.org> wrote:
>> >>
>> >> If you have some really fine non-metallized sandpaper you could give
>> the
>> >> part a few twists on the paper first.
>> >>
>> >> ~Carl
>> >>
>> >>
>> >> On Wed, Jan 27, 2016 at 10:57 AM, Alex Davis via TriEmbed
>> >> <triembed at triembed.org> wrote:
>> >>>
>> >>> I have a QFN part which shows signs of oxidation on the pins, and I'm
>> >>> wondering if there's anything I can or should do to clean it up.
>> >>> Unfortunately, it's an old-stock part, so I can't just get a new one.
>> >>>
>> >>> I have some photos here of the part:
>> >>>
>> >>>
>> https://hackaday.io/project/9150-68040-upgrade-for-powerbook-520c/log/30827-68040-has-arrived
>> >>>
>> >>> I am hoping there's enough un-oxidized metal on each leg that the
>> solder
>> >>> and flux will wet the legs properly. I'll be point soldering a few
>> pins
>> >>> on each side before drag soldering the rest, so I should be able to
>> >>> evaluate if it's going to work before committing to soldering the
>> whole
>> >>> thing.
>> >>>
>> >>> Alex
>> >>>
>> >>>
>> >>> --
>> >>> "The theater of noise is proof of our potential."
>> >>> |\ |  (¯  \/ |¯\  |V| |\ ¯|¯ |¯) | \/ | | | |¯\ (¯   /¯  /\ |V|
>> >>> |-||_ (_  /\ |_/ @| | |-| |  | \ | /\ |^| | |_/ (_ . \_  \/ | |
>> >>>
>> >>> You won't find me on Facebook.
>> >>>
>> >>> _______________________________________________
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>> >>
>> >>
>> >>
>> >>
>> >> --
>> >>
>> >>
>> -------------------------------------------------------------------------------
>> >> Carl J. Nobile (Software Engineer)
>> >> carl.nobile at gmail.com
>> >>
>> >>
>> -------------------------------------------------------------------------------
>> >>
>> >> _______________________________________________
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>> >>
>> >
>> >
>> > _______________________________________________
>> > Triangle, NC Embedded Computing mailing list
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>> > TriEmbed web site: http://TriEmbed.org
>> >
>>       How about the eraser on a #2 pencil?
>>
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