Is that why there are so many PCB fab shops in Phoenix, Rudy? :-)
Different phenomenon than red plague, though, which happens only with 18
meg water. And it doesn't matter whether the metal is passivated or not.
However, low-carbon stainless steels are less prone to it. No one knows
why, to the best of my knowledge. I've seen it occasionally in our old
cleaning machines. We got round it by adding a metered bypass round the
water purification to reduce the resitivity from 18 to ~10 megohm-cm.

Brian

Rudy Sedlak wrote:
> In a message dated 5.29.03 11:45:23 PM Pacific Daylight Time,
> [log in to unmask] writes:
>
> And Rudy adds edits....<grinning>
>
>> You may not know it, but even very pure water will attack stainless
>> <non-passivated> stainless steel, producing "red plague". In fact,
>> this is a fine iron-rust powder that adheres to the surface, but can
>> be wiped off. <Some>Tap water<s> will not do this....
>
>
>
> Brian have you spent much time in Phoenix Arizona?  The tap water there
> is so high in Chloride that it can be used to etch
> metals....---------------------------------------------------
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