Re: [TCML] primary tubing

["Quarkster" <quarkster@xxxxxxx>]

Scot -

None of my plating data show anything remotely that thick for hard anodizing 
on any aluminum alloy. Of course, new processes are being developed all the 
time.

Can you provide pointers to any references showing .027" thick anodizing? 
I'd like to update my library to include this information.

To keep some relationship to Tesla coils, there are anti-corrosion "chemical 
conversion coatings" that are similar to anodizing, but still feature 
relatively high surface conductivity, like the "Alodine" process. These 
coatings are used when aluminum sheetmetal housings and enclosures must be 
conductive so joints, seams and cover plates can be effectively sealed 
against entry or escape of RF energy. This type of surface finish could be 
used on enclosures for the control electronics for solid-state Tesla coils, 
solid-state RSG motor speed controls, etc.

Regards,
Herr Zapp


----- Original Message ----- 
From: "BunnyKiller" <bunnikillr@xxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Monday, November 09, 2009 4:07 PM
Subject: Re: [TCML] primary tubing


> May be a bit off topic but since the topic is ongoing....
>
> MilSpec 01 hard anodize in Black can be as thick as .027"   pretty close 
> to 1/32 of an inch....I have no idea how its done, what baths or chemicals 
> are used but I do agree its brittle and will chip with enough abuse. A 
> previous job required that a part was to be produced with such tolerances, 
> the anodizing company produced the part and charged us accordingly... 
> almost 4X the normal cost....
>
> Scot D
>
>
>
> Quarkster wrote:
>
> > 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
>
>
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