A late reply on this but I knew I had some information on porosity testing
hidden away somewhere.
Dimethylglyoxime is a spot test reagent for nickel in the presence of
ammonia. As far as I can remember the dmg was dissolved in iso-propyl
alcohol (approx 2%)and ammonia added. This solution turns red in the
presence of nickel, and was used as a porosity test for gold on nickel.
I don't have this method for porosity but I do have one using nioxime. This
test was used for porosity of electroplated gold on electroplated nickel on
copper. The minimum coating thicknesses were 2.5 microns (0.0001")gold on 5
microns (0.0002") nickel.
The test uses pressure and current so I doubt if it will be OK for the thin
enig coatings.
If you want the text of the test let me know your fax No.
Geoff Layhe
www.lamar-uk.co.uk

-----Original Message-----
From: Rudy Sedlak [mailto:[log in to unmask]]
Sent: 11 April 2002 02:25
To: [log in to unmask]
Subject: [TN] Nickel Test


I recall seeing a spot test for Nickel that involved using a solution of
Dimethylglyoxime in dilute Ammonia, + ???? as a spot test for gold porosity
to show presence of Nickel.

Does anyone have the exact details of this test?  Does anyone know if it
works on Electroless Nickel?  (Suspect it may not because EN is so much more
passive.)

Rudy Sedlak
RD Chemical Company

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