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November 2005

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From:
"Whittaker, Dewey (AZ75)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Whittaker, Dewey (AZ75)
Date:
Wed, 2 Nov 2005 08:07:02 -0700
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This from a man where Corn is King.
Dewey 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas O. Pauls
Sent: Wednesday, November 02, 2005 7:20 AM
To: [log in to unmask]
Subject: Re: [TN] Gold Plating Peeling...

(note to self - see if Lotus Notes has a Pun filter....................)

Doug Pauls




             "Whittaker, Dewey
             (AZ75)"
             <Dewey.Whittaker@
To
             HONEYWELL.COM>            [log in to unmask]
             Sent by: TechNet
cc
             <[log in to unmask]>
 
Subject
                                       Re: [TN] Gold Plating Peeling...
             11/02/2005 08:12
             AM


             Please respond to
              TechNet E-Mail
                   Forum
             <[log in to unmask]>
             ; Please respond
                    to
             "Whittaker, Dewey
                  (AZ75)"
             <Dewey.Whittaker@
              HONEYWELL.COM>






Yes it is very appealing information. Thanks for the input.
Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard
Sent: Tuesday, November 01, 2005 6:55 AM
To: [log in to unmask]
Subject: Re: [TN] Gold Plating Peeling...

Mike,
This is really good information. I have run into gold peeling problems
several times and because I do not have any pwb fab experience, I feel
sort of helpless when I talk to the pwb vendor and they tell me they
cannot be sure what caused the problem to happen. This list should be a
good reference point from which to ask questions and make sure the
process is controlled. Thank you for taking the time to put it together.
What you have here is a Gold Tab FMEA!

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of R Sedlak
Sent: Tuesday, November 01, 2005 7:44 AM
To: [log in to unmask]
Subject: Re: [TN] Gold Plating Peeling...

Phew Mike, this level of insight and understanding was only earned
through a LOT of pain and pressure... I am impressed!

Rudy Sedlak

"Barmuta, Mike" <[log in to unmask]> wrote:
Hi Rudy and All: Careful on compartmentalizing the cause of peeling
plating to only improper cleaning or oxidation. In general terms it's
true that things like stripping, cleaning, surface preparation, rinsing
and activation can result in peeling plating. Which I would include in
your cleaning/oxidation category. However the list of overall causes is
quite long.

I know this doesn't really apply to Steve's original question, he's more
concerned with the cure than the cause.

FYI Here is a partial list of some other causes of plating adhesion on
bussed Ni-Au that may be of value to those fighting this problem.

Additional food for thought:

* Improper sealing or conformance of the plating resist around the
circuits.

* Plating resist not compatible with the temperatures and chemistry of
the preclean and plating process.

* Plating resist not compatible with the gas evolution of the Au plate
at the cathode.

* Entering the plating at an incorrect amperage.

* Malfunctioning rectifier.

* Bad anode connections

* Bad cathode connections

* Incorrect anode/cathode ratio

* Incorrect anode/cathode spacing.

* Improper metal concentration in the plating bath

* Organic contamination in the plating bath.

* Trace metal contamination.

* pH of plating bath out of specification.

* Excessive brightner/leveler in the plating bath.

I've spent many late Friday nights chasing these problems around the
board shop after the dreaded scream "PEELERS" emanated from the QA dept.
Why was it always Friday afternoon when they found them??


Regards

Michael Barmuta

Staff Engineer

Fluke Corp.

Everett WA

425-446-6076




-----Original Message-----
From: TechNet [ mailto:[log in to unmask]]On Behalf Of R Sedlak
Sent: Friday, October 28, 2005 12:56 PM
To: [log in to unmask]
Subject: Re: [TN] Gold Plating Peeling...


Steve: The usual cause of peeling plating is plating on to a
dirty/oxized surface.

Can it be reworked.... possibly, making sure that you get rid of the
original problem which caused the problem initially.

Can it be reworked in a way which is essentially guaranteed to work 99+%
of the cases? Probably not.

Perhaps some sort of incoming inspection/test might be worth
considering?

Rudy Sedlak
RD Chemical Company

Steve Gregory wrote:
Well, I just got back from "Sin City", and as they say; "no rest for the
wicked".

I really wasn't that wicked, but I was confronted with a new problem
this morning.

We just built some assemblies and conformal coated them, but when they
were being de-masked, the gold plating on the fingers started peeling
up! Check out:


http://www.stevezeva.homestead.com/files/Peeling_Plating.jpg

http://www.stevezeva.homestead.com/files/Peeling_Plating_2.jpg

I have a couple of questions:

Can I repair this?

If I repair this, should all fingers be stripped and repaired?

Kind regards,

-Steve Gregory-
Senior Process Engineer
LaBarge Incorporated
Tulsa, Oklahoma
(918) 459-2285
(918) 459-2350 FAX
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