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Re: [TCML] primary tubing

Brian -
As I said, anodizing is an electrochemical process, typically using a chromic or sulphuric acid bath in conjunction with a DC current to accelerate the formation of the surface oxide.
The total thickness of the aluminum oxide layer obtained by conventional (Type II) anodizing is typically between 2-25 micrometers, or .00008 - .001 inch. "Hard anodizing" can generate oxide films up to 150 micrometers (.006 inch) thick, but these tend to be very brittle, and any deformation of the underlying metal (bending or forming) can cause the oxide film to crack and flake off.
There is no known anodizing process that can generate an oxide layer 1/32 to 1/16 inch thick. 

Regards,
Herr Zapp
----- Original Message ----- From: "Brian" <brianv@xxxxxxxx> 
To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
Sent: Monday, November 09, 2009 5:59 AM
Subject: RE: [TCML] primary tubing



Herr Zapp,
You are correct in that they are similar however there are some differences, aluminum is actually put into an acid bath to create the anodize and change 
the molecular structure of the surface, I have tested various types of
anodizing for voltage withstand, as anodizing changes the chemical makeup of 
the surface, normal is depth is anywhere from 1/16" to 1/32" below the
surface.
(snip) 
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