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topic 7642

Cleaning Nickel Clad Finish


I have a problem with a "green verdigris" on a nickel clad finish, it is on the inside of a sterilizer chamber. The specs on the sterilizer state the coating is 25 thousands thick over flanged steel. The sterilizer uses WFI (water for injection) or distilled water @ 180 degrees and clean steam (steam made from WFI). We are trying to remove the green with abrasive pads (Scotch Brite [linked by editor to product info at Amazon]) but it is a long process. Does anybody know of a way to chemically remove the green without leaving any residue? The sterilizer is used to clean pharamaceutial componets and we can't have any contamination left after the cleaning.

Roger J. Rinard
-Buffalo, New York

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