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March 1997

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Subject:
Re[2]: Microsectioning
From:
[log in to unmask]
Date:
Thu, 27 Mar 97 09:49:09 EST
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     How about for nickel/gold?  Can you bring out the grain structure of 
     the nickel at all?
     
     Matt Byrne
______________________________ Reply Separator _________________________________
Subject: Re: Microsectioning
Author:  [log in to unmask] at SMTPLINK-HADCO
Date:    3/25/97 09:54 AM


I have always prefered the NH3 H2O2 etch.  But as you found out, 
it has a limited shelf life.  Because of this, (in a past life) 
we would mix up a few drops at a time in a watch glass as needed, 
and dip the sections in the watch glass.  In these volumes, 
evaporation tended to keep the solution fresh.  And  when it all 
evaporated, well, make up another 10 drop batch.  So we had a 
small bottle of NH3 and one of H2O2 at the grinding table, with a 
watch glass and paper towels.  One used q-tips, the others just 
dipped in the watch glass.  
     
-- 
George Franck
Principal Product Engineer
Raytheon E-Systems
Falls Church Va
     
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