How would pumice scrub play in the formation of nodules and what 
     preclean stage may you be referring to?
     
     Don Hoppe - Zycon


______________________________ Reply Separator _________________________________
Subject: Re: Copper plating
Author:  [log in to unmask] at corp
Date:    12/19/96 9:48 PM


I would suggest looking more closely at the preclean. Is it possible that 
you are using Aluminum oxide or pumice preclean?
     
Dave Rooke
Circo Craft - Pointe Claire
     
---------------------
>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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