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 --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------