Re: [alfa] Stainless

["Bob Gauthier" <gauth@xxxxxxxx>]

The process for this is called passivation. It is used for a few reasons,
one, to remove any bits of tool steel left on the surface from the machining
/ bending/ fabricating process, and also, as Mark describes, to make micro
surfaces changes on the material.

At least this is what I remember from my design days!

----- Original Message -----
From: Mark Denovich <mark@domain.elided>
To: Alfa Digest <alfa@domain.elided>
Sent: Wednesday, January 14, 2004 9:13 PM
Subject: Re: [alfa] Stainless


> Darren Leung wrote:
>
> > I'd hate to see this topic digress to the point of people believing that
> > 'quality stainless' is brittle, and that's that.  There are many, many
types
> > of stainless out there, some less brittle than others, and a simple
google
> > search yields this page:
> > http://www.cozeburn.com/stainless.asp
>
> Why not go straight to the exhaust experts:
>
http://www.burnsstainless.com/TechArticles/Stainless_article/stainless_artic
le.html
> (wow, they sell really neat stuff...   I really want to get a TIG welder
>    now.)
>
> Also, to really keep stainless from rusting it should be "pickled" after
> it is machined or welded.   The pickling process uses nitric acid to eat
> away the top layer of Iron atoms leaving behind a surface with a much
> higher ratio of chromium atoms... these quickly oxidize to produce the
> durable rust proof coating that keeps SS from rusting.    This is why
> you also should NOT use steel wool on stainless as you can embed bits of
> Fe on the surface of the SS and it will start to rust (although slowly.)
>
> --Mark
> The Alfa Wiki: http://alfa.denovich.org
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