On Sun, 25 Feb 2001, Bradley M. Small wrote:
>
> >From one of the amateur telescope makers there is also this site, that
> explains how to anodize aluminum
>
> http://www.focuser.com/atm/anodize/anodize.html
>
> Seems a simple enough and relatively inexpensive process. I haven't tried
> it, but it would be worth a shot.
This is indeed a very nice site! I just skimmed through it and it looks
fairly complete. I'll have to add a link to it from the cameramakers
page. Saves me writing something up.
I have tried anodizing, and yes it is fairly straight forward. The
temperature is somewhat critical though. At high temperatures the acid
bath dissolves the oxide layer as fast as it forms and the net result is
electro-polishing. At more or less room temperature the resulting oxide
film is porous and can be dyed as was done in the web article, and at
lower temperatures the oxide layer becomes much more dense (hard
anodizing). The hard film will be a dark grey, and won't dye particularly
well if at all. This film is usually used for wear resistant coatings.
- Wayde
([EMAIL PROTECTED])
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