[TCML] primary tubing

[Quarkster]

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 at merr.com>
To: "'Tesla Coil Mailing List'" <tesla at pupman.com>
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)