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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