----------
From:  Vera Payne
Sent:  Thursday, December 19, 1996 7:47 AM
To:  'Timothy Gaylor'
Subject:  RE: Copper plating

Timothy,

Is it possible that your tanks have contamination in them?  We had the same problem at one time, and we dummy plated a few loads to try to "plate out" the contaminants.  It did remove most of the problem, but we also followed it with a full blown carbon treat.  That took care of any remaining problems.


Vera Payne
Graphic Electronics Inc.
www.geicircuits.com

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From:  Timothy Gaylor[SMTP:[log in to unmask]]
Sent:  Wednesday, December 18, 1996 9:05 PM
To:  [log in to unmask]
Subject:  Copper plating

We have been exhibiting miniature size nodules on our panels for quite
some time. These miniatue nodules resemble a slightly high brightner
burn. 
I was wondering if anybody can give me a few suggestions to where I
should look. 
 
Afew test I have ran were with bare laminate through a scrubber before
plating. Nodules appeared on them. 
 
Afew more experiments were ran through different preclean lines and all
led to the same result, nodules.

My questions if anybody could help are:
1. Would a rectifier with too high ripple affect the leveling of copper
plating?
2. We currently hot load our racks into the bath, the program is set up
with a five second lag  and raises from 0 amp to calculated amperage. So
the panel sees 5 seconds of 0 amps before the rectifier applies voltage.
Could this be a contributor? 

Timothy Gaylor

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