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[Amps] Caustic soda

To: <amps@contesting.com>
Subject: [Amps] Caustic soda
From: "Barrie Smith" <barrie@centric.net>
Date: Sun, 23 Jul 2006 11:38:38 -0600
List-post: <mailto:amps@contesting.com>
Caustic soda and aluminum.

A few years back I built some heat-sinks for the diodes in a power supply.  
Since they were two piece units, I drilled and tapped the aluminum for final 
assembly.

I then immersed the pieces in a sodium hydroxide solution to lend a nice satin 
finish.

After that treatment, the threads I had so carefully tapped were gone.  I had 
to go to a larger bolt.

The sodium hydroxide removes quite a bit of material, so any precision work 
should be done after the  treatment.

Barrie, W7ALW, DN36au,
QRV 6M, 432 & 1296 EME
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