Cleaning, Descaling, and Passivation of Stainless Steel This standard is issued under the fixed designation A; the number immediately. Pickling, passivation and removing iron contamination with nitric acid ASTM A – Practice for Cleaning, Descaling and Passivating of Stainless Steel Parts, . Passivation per ASTM A Posted on November 29, Latest News. APT to Exhibit at SHOT Show in Las Vegas, NV. Advanced Plating.
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Passivation of 316L SS per ASTM A380
Although cannot see the reason obviously myself? This formula should not hurt your electropolished surfaces.
There are better formulations for doing what you want, however, that are available on a proprietary basis. It is also quite out of date and needs to be updated. I am not sure exactly what you want to do, but the citric formulations can give you increased performance over the old nitric formulations. Let us know if we can help.
Adtm think you may be thinking of ammonium hydrogen difluoride which is often used in place of hydrofluoric acid in pickle solutions.
Article: Passivation of stainless steels
This would attack electro-polished surfaces and is not the kindest way to treat them. I agree with Lee that what you are proposing should not be a problem with the EP’d surfaces.
If you let this solution inside your S. To my knowledge it is not possible to do a combination pickling and passivation.
I believe you must pickle the spools with an acid which contains fluoride in some form — often a standard nitric-hydrofluoric pickling acid or pickling paste, and follow this either with electropolishing passivtaion with nitric acid passivation or citric acid passivation to the standards discussed above. You do not need super quality water for these processes; DI or RO water will be fine.
Usually it is best to send the spools to a metal finishing shop which is already experienced in and equipped for the process. If the piping system is psssivation assembled, there are service companies which specialize in on-site projects of this sort, like Astropak. It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer.
From beautiful Pine Beach New Jersey: I currently need to passivate a partly electropolished L stainless steel process system. Could someone confirm or deny this effect?
Lee Kremer Stellar Solutions, Inc.
Regards, Ted Mooney, P.