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Re: Metal oxidation techniques

I am delighted to be able to respond to a query dealing with the creation,
rather than the prevention, of oxidation.  I passed this on to my brother,
who works at NIST in corrosion, stress and fractures, and he responded as

"If you immerse in a brine bath, the rust will form but will not stick.
Have them try spritzing with saturated brine solution in a spray bottle and
hang the parts in the sun or in an oven  spritzing occasionally.  300F
should do the trick.  But at that the rate of rusting will be slower than
what they were doing with the chemicals."

>We are working with a very small metal fabrication firm which produces
>small- to medium-sized ornamental metal products.  Their best selling
>finish for these products is "rustic" (heavy emphasis on rust).  Their raw
>material is 24 gauge mild steel sheet, which, after fabrication, is
>oxidized using a commercially-available solution which is largely nitric
>acid, with minor amounts of sodium nitrate and potassium chlorate.
>We would like to find an alternative product or technique to produce the
>oxidized finish, particularly something which is less expensive and more
>environmentally friendly.  Two options which have been discussed have been
>a brine bath and a calcium hypochlorite solution bath.  Does anyone have
>any experience with producing this kind of finish on steel?
>Thanks for your assistance.
>Jon Hudson
>******************Montana P2 Program*******************
>Jon Hudson
>Pollution Prevention Technical Specialist
>MSU Extension Service
>Taylor Hall    (406) 994-3451
>Box 173580    (fax) 994-5417
>Bozeman, MT 59717-3580       toll-free (888) MSU-6872
>*******Pollution Prevention Makes Business Sense*******

Terry Foecke, Managing Partner
Materials Productivity LLC
1821 University Avenue, Suite S-286
St. Paul, MN   55104
(p) 651-603-8282
(f) 651-603-8286