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topic 202

Frostiness in electropolishing pharmaceutical fittings


We have had problems with electropolishing of stainless steel pharmaceutical fittings. Even with the same heat number, some come out fine, while others from the same batch come out frosty on the I.D..

What are the variable to watch for to make all the parts come out okay.

Specific gravity? How often change of acid bath? Voltage, amps, and times? Other suggestions?

Robert Fill

Etching is usually due to excess water or insufficient current density. A first guess is that since the problem is on I.D.s, the cause is low current density.

Good reference chapters can be found in the Electroplating Engineering Handbook, and the Metal Finishing Guidebook & Directory. Also, AESF has an excellent illustrated lecture on electropolishing.

Ted Mooney, Teds signature
Ted Mooney, P.E. RET
Pine Beach, New Jersey

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