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January 2012

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Subject:
From:
Chris Mahanna <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Chris Mahanna <[log in to unmask]>
Date:
Mon, 16 Jan 2012 12:48:52 -0500
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Hi Victor,

Chemist:  No
Etchant SME: No
Etched a bazillion PB and PBA microsections: Yes

I suspect your primary variable is the catalyzation.  We also find that the DI water does more harm than good.
We rub the wet cotton swap on copper foil, then re-apply the etchant, then etch the sample in a 'random' orbital pattern for 3 to 5 seconds.  You will learn quickly the saturation of blue on the cotton ball that produces a quality microetch.
Keep your copper foil clean, or you'll transfer to the mount.

I know some of our competitors put very small pieces of copper foil directly in the etchant container.

Using drug store peroxide seems to help the usable life of the etchant, but it still is only good for maybe 2 hours.

BTW, we JUST added this catalyst step to the new draft IPC microsection method at Midwest.

Chris 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
Sent: 2012/01/16 12:21 PM
To: [log in to unmask]
Subject: [TN] Copper etchant, 1:1:1

Folks,

   Is there a real chemist out there  or someone very knowledgeable of etchants?
        DI water                                        10ml
        Ammonium Hydroxide      28.0 - 30.0%    10ml
        Hydrogen Peroxide               35              10ML
        Polish, 6, 3, & 1 micron
Final polish 0.05 Alumina suspension
        3 -5 seconds, flush with water

Which of the two chemicals would I increase volume to get stronger delineation/demarcation region of plated copper.   The process being equal will not yield the same etchant quality.  The variable is the quality of overseas copper suppliers.

Victor,




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