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

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Passivation

I need to know a method of passivation of stainless steel but without using any hexavalent chromium compounds and thus offer Rohs certificate.

Oscar Villalobos
plating shop employee - Guadalajara, Jalisco, Mexico
February 6, 2009

Both citric acid and ASTM A967 Nitric 4 passivation processes employ Cr-free chemistry and are suitable for a wide range of alloys.

Terry Lycans
Aerospace - Dayton, Ohio, USA
February 10, 2009

I am out of date, but I was not aware that any common citric passivation formulas contained chromates.

James Watts
- Navarre, Florida
February 12, 2009

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