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From [log in to unmask] Fri Mar 28 16: |
54:19 1997 |
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Hi Technetters,
I have observed long term reliability problems with this exact issue
when I worked for the Burroughs Corp (now part of Unisys) many moons
ago.
The issue is "crrepage" of the tin/lead through the gold srface over a
long period of time, resultiong in a tin/lead/gold alloy subject to
fretting corrosion.
Any help I can offer, please contact me directly.
Regards,
Ed Popielarski
QTA Machine
714-364-6614
You wrote:
>
>Darrell Daigle wrote:
>>
>> Hello technetters, I will try this for the fifth time,I apologize if
your
>> file is loaded with this request, it has been returned to me as
undelivered
>> mail.
>>
>> If a gold finger with splashes of tin/lead on it "does not" make
contact
>> within a gold socket, will there be galvanic corrosion.
>> Unfortunately IPC-A-600 does not address reliability issues, if
there is
>> reference material out there, I would like to know.
>
>Hello All:
>
>Along similar lines I have observed select corrosion of solder occurr
>during the resist stripping process, but only solder connected to gold
>tabs. It was presumed a galvanic corrosion was taking place but the
>"pathway" of this corrosion has not been identified. Perhaps anyone
>with an answer to the above question could shed some light on this
>problem as well. Thanks for your assistance!
>
>Regards,
>Ted Stern
>
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