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January 1998

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Subject:
From:
Fred Johnson <[log in to unmask]>
Reply To:
TechNet Mail Forum.
Date:
Mon, 19 Jan 1998 13:55:19 +0000
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Edward, regarding your question about DMAB reduced oxide; yes, it
certainly does make the oxide conductive - that is why it is important to
insure that your copper content of your microetch is low so that it does
not leave copper sulfate crystals on the surface, and that your pre-dip
bath is not "dirty" - full of copper hydroxide - because that can deposit on
the surface as well.  The end result is shorts, and this has been a fairly
common problem at a variety of PWB shops.

Regards,
Fred J.

>>> "Eltek Ltd. - Process Engineering"
<[log in to unmask]> 01/18/98 01:56am >>>
Hi Technetters !
Some time ago I tried to test electrical conductivity of the reduced black
oxide : I placed a piece of conducting rubber on reduced black oxide area
and measured conductivity between this area and the upper part of the
rubber
.The innerlayer was rinsed in DI water and dryied at 95 centigrade to take
away any moisture . The purpose of the rubber was to avoid  scraches
on
black oxide . I was suprised , but it was conducting .
Does anyone has explaination what is the mechanism ? I would expect ,
that
dry crystals of cupric and cuprous oxide should not conduct . One of my
friends told me , that one of crystal form of cuprous oxide is conducting .
Best regards
Edward Szpruch
Eltek Ltd - Israel
Tel  972 3 9395050
Fax 972 3 9309581
E-mail :  [log in to unmask]

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