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Re: Stainless and Water
Frank,
So where can there common man pick up this "Good" 300 series stainless.
Patrick J
----- Original Message -----
From: <YoHoHo at aol_com>
To: <KillieTalk at aka_org>
Sent: Thursday, March 07, 2002 12:58 PM
Subject: Re: Stainless and Water
> You guys are not correct. 400 series stainless will rust, etc, but a good
> high chromium stainless in the 300 series will not rust. I selected the
> materials for the deionized water pumps for the space shuttle, and the
> requirement was NO dissolution of anything (above the fractional parts per
> million range) into the water. A great deal of testing went into the
> material selection, and that is the best choice for keeping your water
from
> attacking the material of construction. They have now been running for
years
> with no corrosion at all. Just make sure that the stainless is
passivated,
> if you really want to be clean. That only removes the minute amount of Fe
> ions on the surface.
>
> "Good" 300 series stainless formulations have the higher percentages of
> chrome/nickel, such as 18/8 and above. They will NOT dissolve any small
> amounts of metal into your system, provided they have been passivated.
>
> Frank Carriglitto
> BS Chemistry, MS Metallurgical and Materials Engineering
> AKA #08234
>
>
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