Hello Mac,
I know you intend to use stainless steel, but even this kind of steel can
present oxidation problems if it is not top quality.
Have you considered using anodized aluminum? After anodization this material
can be dyed with special dyestuffs of many colors and sealed with a nickel
salt. This surface treatment improves the resistence of the surface at the same
time it gives a homogeneus color that has an awsome oxidation resistence. The
light fastness is also very good and the color will last for many years. This
kind of treatment has been used in satellites and spacecrafts, masts for
sailboats, window frames in buildings, etc.
Best regards,
Ricardo Cernic
São Paulo - Brazil
---------- Início da mensagem original -----------
De: [EMAIL PROTECTED]
Para: "Sundial Mailing List" sundial@uni-koeln.de
Cc:
Data: Wed, 23 Apr 2008 20:59:16 -0400
Assunto: Request for suggestions
>
> Hello friends,
>
> Does anyone know a simple, safe, and inexpensive method to
> permanently darken stainless steel?
>
> I'm involved in a project to create a vertical decliner (48 inches
> wide by 30 inches high by 1 inch thick cast concrete) sundial for our
> town's Municipal Center showing hours until sunset. For the hour
> lines we intend to use 1/4 inch square stainless steel bars imbedded
> into the concrete.
>
> Test castings show that, when sunlit, the imbedded bars appear dark
> from most viewing angles, but that from some angles reflect light so
> as to almost disappear. Although the changing appearance of the hour
> lines might be considered a positive feature, I'd rather the hour
> lines always looked dark.
>
> Thanks for any suggestions.
>
> Mac Oglesby
>
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