When I had this problem many years ago it was because the anode bag had
been pulled up tight against the bottom of the anode.  I have also heard
from others that a napped bag with too tight of a weave will not allow
the copper sulfate that forms at the anode during electrolysis to
migrate through the bag before it becomes so concentrated that it salts
out.
 ----------
From: tonghh
To: [log in to unmask]
Subject: Acid copper bath
Date: Monday, March 17, 1997 9:49AM


   To all technet users ,

   Quite often I experience copper crystallization in the acid copper
bath
which
results in plating distribution problem .Apart from the several factors
that
affect this crystallisation -fluctuating current , concentration of the
bath , anode bag , anode basket etc -maybe someone would like to share
more
on this problem and how to overcome this in the plating line.

Thanks .

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