Re: Stainless and Water

[George Slusarczuk <yurko at warwick_net>]

Hello Frank,

You are probably right, but just out of curiosity -- how much did the
circulation pump cost?

Best,

George



YoHoHo at aol_com wrote:
> 
> 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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References:

• Re: Stainless and Water
• From: YoHoHo at aol_com

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