Re: [TCML] primary tubing

[BunnyKiller <bunnikillr@xxxxxxx>]

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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