Sounds like you are getting some co-deposit with your copper plating.
What type of cycle are you running DC AC/Pulse?  Are you using Anode
Bars (bags) or CU Ingots (baskets)?


Jeffrey Bush
Director, Quality Assurance and Technical Support

VERMONT CIRCUITS INCORPORATED
  76 Technology Drive - POB 1890
    Brattleboro, Vermont 05302
      Voice: 802.257.4571.21 Fax: 802.257.0011
           http://www.vtcircuits.com
 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Anan Zreik
Sent: Thursday, September 01, 2005 9:19 AM
To: [log in to unmask]
Subject: [TN] chocolate plating

'
Hi every body :

every so often for a long period of time we get a "chocolate copper"
residue on the surface of our boards on our electrolytic copper plating
line . This "chocolate plating" can be removed by hand , and it is not
connected to the copper below .

does anybody know this phenomena , and its cause??

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