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topic 4968

Electropolishing of SS.


Hello, We are facing problem of white patches inside 1" Dia tubes ,3 mtr long which are being Electropolished by us.we immerse the tubes vertically in the bath.What are the cause? What are the remedies for removing the patches? Please suggest or guide us. Thanks, Mahesh.

Mahesh Raja
- mumbai,maharashtra,India


Electropolishing requires high current density and fresh solution. It may be possible to electropolish this item with auxiliary cathodes and good solution changeover. But if you are just putting them into an electropolishing tank like any other work and are expecting the insides to polish up, then I think your expectations are probably unrealistic. Good luck.

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


The white patches appearing on the ID of your tubes could be a residue from your electrolyte. Insure that when you remove the tubes after processing from your tank, that the current is OFF and check your washing procedures giving particular attention to the internal surfaces.

Joel Levinsohn
Joel Levinsohn
- Sydney, Australia

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