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Mixed-acid Cleaning of Stainless Steel

Help! I am looking for info on acid corrosion control during removal of Iron contamination from Stainless Steel (304, 316).

Specifically pickling/circulating a mixed acid (20%HNO3-4% HF) solution at 90-160 Deg F through pipes.

Does this combination work at ambient temperature?

what is the maximum safe temperature, contact time and dosage of corrosion inhibitor?

Rodine is commonly used for inhibiting HF acid, however data on mixed acids is needed.

Hyder Razvi
- Houston, Texas
2000

Hyder:

First of all, there is NO temperature at which this mixture is "safe". I do not know what inhibitors will help you with this very aggressive mixture, but there are safer and better ways to accomplish the iron removal.

We have formulae that are used very safely and effectively for this application without the need of inhibitors or hazard control. If you are interested, please give us a call or email.

Lee Kremer
Stellar Solutions, Inc.

McHenry, Illinois

2000

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