I think there is a steel used in building skyscrapers that is subjected to "controlled oxidation." It is called Cor-Ten Steel or something to that effect IIRC.
Cheers,
Greg "rust never sleeps" Parker
Ann Arbor, MI USA
> Date: 18 Feb 2003 22:13:55 -0000
> From: "Steve Kurt" <kurtsj@mtco.com>
> To: classicrendezvous@bikelist.org
> Subject: [CR]Re: Anodized Finishes
>
> Ray asks:
> "Also I notice that when anodizing is discussed I always see Aluminum as
> the substrait. I was wondering if other metals can be anodized. I ask this
> because I own a classic Claude Butler frame that is 531 but looks to be
> anodized and I need to do some restoration on the rear triangle. Has anyone
> heard of steel alloy anodizing?
> Ray Homiski Elizabeth, NJ"
>
> As I understand it, anodizing of aluminim is simply a controlled process of
> oxidation. It's rare that anyone has a controlled oxidation of steel, but
> when it happens, I think it's just called "rust". <grin> The mystery is
> why oxidized aluminum is so good, when oxidized steel is so bad.
>
> The closest analog of anodizing for steel might just be chrome (or nickel)
> plating. It provides a hard, corrosion resistant layer that just happens
> to look nice too. There are some darker chrome plating methods that might
> be what your bike has. Got any pics to share?
>
> good luck,
> Steve Kurt
> Peoria, IL