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Ted Mooney, P.E. RET
Pine Beach, NJ

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Stainless Steel Pickling Solutions

Can someone indentify the process by which a nitric/hydroflouic based solution is developed and maintained. Sounds simple enough - but the materials are reactive and I am wondering if there are alternatives (ammonia bi-fluoride, I.E.)?

Phil Parsche
GM Finishing Shop - Pleasant Prairie, Wisconsin
January 23, 2008

Ammonium bifluoride is often used to supply the fluoride ion because of safety problems with HF. A typical solution is 25% Nitric acid + 8 oz/gal ammonium bifluoride.

Jeffrey Holmes, CEF
Spartanburg, South Carolina
January 25, 2008

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