[Boatanchors] Rust, Coatings, etc.

[Paul Kraemer]

John Deere corporate headquarters in Moline IL.
Pittsburgh Steel Corten or something like that
It is a place of beauty
Ought to be for what they charge for garden tractors---even though they are 
good.
Paul K0UYA
----- Original Message ----- 
From: "Michael D. Harmon" <mharmon at att.net>
To: <boatanchors at mailman.qth.net>
Sent: Sunday, April 07, 2013 9:38 PM
Subject: [Boatanchors] Rust, Coatings, etc.


> I've been reading the thread about rust converting coatings, and I 
> remembered something from about 35+ years ago that I've always wondered 
> about.
>
> Westinghouse built a factory back in the Seventies in Jefferson City, MO 
> when I lived there (later bought by ABB).  They manufactured big 
> industrial transformers and switchgear, as I recall.
>
> Once they had the exterior of the building completed, they treated it with 
> something that made it rust.  Yes, that's right - as in the reddish-brown 
> iron oxide.  As first it looked pretty bad but after a while it settled 
> into a deep red-brown color and actually looked sort of unobtrusive.  Not 
> what you'd expect from a big steel building covering several acres.  I 
> asked someone why they did that and was told that the rust was only 
> surface deep and permanently protected the underlying steel from further 
> corrosion.
>
> I'm wondering if any of you have ever heard of a similar situation where 
> rust was used as a protective coating?  Does the process have a name? 
> Does it work somewhat like gun blue?  Gun blue uses phosphoric acid and 
> creates a deep blackish-blue protective coating (iron phosphate?), but can 
> rust if you leave salty fingerprints on the surface and don't keep the 
> surface protected with a light film of oil.  You don't find many shops 
> that do hot-dip bluing any more, because the salts and solutions (and 
> fumes) used in the process are pretty noxious.
>
> Mike, WB0LDJ
> mharmon at att dot net
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