[TriEmbed] soldering oxidized pins - QFN part

[Scott Hall]

Same stuff used on my saxophones to clean up the corrosion that occurs on
each port that causes the pads to stick.  Its got red rouge on one side,
and a black fine substance on the other side (the red side toward the
metal, the black side toward the leather).

Another trick musicians use is an old dollar bill.

- sgh


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."
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>>>
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>>>
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>>
>>
>>
>> --
>>
>> -------------------------------------------------------------------------------
>> Carl J. Nobile (Software Engineer)
>> carl.nobile at gmail.com
>>
>> -------------------------------------------------------------------------------
>>
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>>
>
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>


-- 
Scott G. Hall
Raleigh, NC, USA
scottghall1 at gmail.com
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