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June 2004

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Subject:
From:
Richard Kraszewski <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 16 Jun 2004 23:01:20 -0500
Content-Type:
text/plain
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text/plain (102 lines)
I very much appreciate the time you took to present your reply.  It has
been EXTREMELY useful to me and my organization.

Again thanks.

Rich Kraszewski 
Advanced Manufacturing Engineer - KEDS
Phone:  260.925.8919
 
 
 


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dave Chapman
Sent: Wednesday, June 16, 2004 10:44 AM
To: [log in to unmask]
Subject: Re: [TN] Yellow Discoloration of Immersion Silver Boards


Very easy to replate Immersion Silver. Bath was probably low on Nitric.
I have boards wrapped in paper in my desk drawer from 3 years ago and
every 6 months I take one out and solder it. My board in May was the
first I saw of any solderability issues. But if it's a concern...have
them re-run them. Simplicity since no stripping is needed. Dave C.

-----Original Message-----
From: Richard Kraszewski [mailto:[log in to unmask]]
Sent: Wednesday, June 16, 2004 9:13 AM
To: [log in to unmask]
Subject: [TN] Yellow Discoloration of Immersion Silver Boards


We are seeing yellow discoloration of Immersion Silver Boards right out
of the package from our board house.  They seem to solder fine, however
this is causing some concern with our customer.  I suspect that it could
be a thin film of  silver bromide or silver carbonate both which are
yellow powders.

Any one seen this before?

What is it?

How does the board house remedy this situation?

Any associated concerns or other bits of wisdom?

I would truly appreciate any input.


Rich Kraszewski

Advanced Manufacturing Engineer - KEDS

Phone:  260.925.8919









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