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Passivation using phosphoric acid

Is it possible to passivate a 316 stainless steel tank using phosphoric acid? will the passivation still be effective if I use the stainless steel tank to hold 80%vol phosphoric acid?

Girly Milio
laboratory analyst - Metro Manila, Philippines
2007

No, phosphoric acid does not passivate stainless steel. That requires citric or nitric acid. Storage of phosphoric shouldn't be a problem, however.

Ray Kremer
Stellar Solutions, Inc.

McHenry, Illinois

2007

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