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47:24 1997 |
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I have been advised by our Materials Laboratory that the following
etch is excellent for defining cracks or grain structures of a
microsection:
100mls DI water
10g sodium dichromate
2mls conc.sulphuric acid
This has the advantage of not "going off" and keeps for a good six
months!
Cotton swab for 5-10Secs
Clive ffitch
MBUK
______________________________ Reply Separator _________________________________
Subject: Microsectioning
Author: [log in to unmask] at INTERNET
Date: 25-03-97 7:01
Technetters,
I am searching for the best way to etch a microsection. The way we
currently do it is Hydrogen peroxide/ammonia. It seems inconsistent as
it is used throughout the day. When the etch is new we get an extremely
good line of demarcation between the clad and plated copper.
Occasionally, we see a line where the plater actually pulls the rack
out of the bath, plugs the hole and returns it to the bath for a higher
thickness. We apply the etch with a cotton swab for approximately 10
seconds.
I am wondering if this is a common technique for microsection etching?
T.A. Gaylor
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