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Cleaning SS smut free

Hi. I have a question with regards to cleaning magnetic SS. We are doing medical parts that require a clean smut-free service. Our bath after a very short cycle builds up with a dark carbon-like substance. We inserted magnets in the solution and it removes this material. If we installed a rectifier with reverse current would this change the polarity of the SS so that the smut will not attach to the parts? Or do you have any other ideas that would work for us?
Thanks for any help you can provide.

Frank Coscina
owner - Terryville Connecticut
September 23, 2011

Please describe your treatment cycle. The part is likely anodic in your etch, so you wouldn't want to reverse the current and make it cathodic. That would cause more smutting not less. Good agitation and filtration will help.

Jon Barrows, MSF, EHSSC
Kansas City
September 26, 2011

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