In a message dated 06/07/2000 7:09:16 PM Central Daylight Time,
[log in to unmask] writes:
> Do you mean they want NiAu on contact fingers and/or contact pads,
> i presume, common enough design "mistake" .
> Done it , conformals won't protect your beans from bath compositions;
> i poured latex over all but the pads in questions
> (you face a serious chore of fine shaving and polishing down to copper),
> than replate , than peel all the latex off (multi's spot on would do),
> clean .
> Noo , you definitely do not gild over solder.
> If you handle it with feel for stress/flex/esd/etc.,
> yo may live to tell .
> Steve will tell you all the spot plating kits,
> if don't feel game to dip plate .
> You may search some on http://www.riogrande.com too
>
> paul
Hi again Ralph!
After reading Pauls response, it makes more sense in assuming that you have
some loaded boards that need gold plated contact fingers...but there's the
"monkey-wrench".
I do have a source for equipment to replate individual fingers, but that's
usually for already plated fingers that may get a solder splash or two in the
contact area. One needs to remove ALL the solder in order to get the kind of
metallurgical bond that won't suffer "peeling" of the replated metal because
of the forces involved during the insertions and withdrawal of the board (I'm
assuming that it's some sort of PCI card, or plug-in board that inserts into
some sort of edge connector socket).
Sounds to me like you have a MAJOR task trying to do this. Paul did say that
he's used latex to cover and protect components to replate in a bath, but
there was a post not too long ago where someone was asking how to remove
latex mask from between some fine pitch part leads that did not peel off when
removing the mask...tough stuff to do.
Don't know how many boards you are talking about, but to remove any and all
solder traces from the fingers is a must for any replating to be
effective...that's gonna be the bear...you're gonna need to get down to bare
copper. Then nickel will need to be plated, then the gold.
The first question that comes to mind, is how did it slip by your customer
when they first got the boards and wanted gold plated fingers, let them get
on the floor and get built? I know that's neither here or there, but makes
you wonder...
I know they are probably coming to you to try and help them out of a bad
situation where it's not your fault at all, but just trying to see if there's
anyway that can be done to correct things for them...but in my opinion, the
damage is done.
One comment, please don't take no offense, www.larrylobster.com has got to be
the most unusual and creative name for a fab shop that I've ever heard of!!
If I may ask, how did ya'll come up with that URL? Just curious....
If you need the contact info on the manual replating kits, let me know. I
have it all at work and I'm home now. I do know it's from a company called;
"Hunter Products" and it's called a "Micro-metalizer System". They don't have
a web page, but I do have the phone numbers and stuff like that...they're on
the usa east coast somewhere...
-Steve Gregory-
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