In a message dated 2/2/01 3:55:25 PM Pacific Standard Time,
[log in to unmask] writes:

> *       Have there been any incidences in the past where the system has been
>  left on during nitric passivation? In this case, the tank has been etched
>  and will not form a passive regardless of what is done to it unless it is
>  re-electropolished.

I would repectively disagree with the above.  It is my understanding that you
can passivate Stainless, as long as there is metal remaining.  Passivation
forms an insoluble oxide coat, mostly of Chromium.  If the surface has been
etched away, it is my understanding that the Nitric eats/etches until it gets
to a surface that it can passivate, and stops....and does the job.

Rudy Sedlak
RD Chemical Company

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