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RoHS Passivation

A potential customer, is stating that Passivation solutions containing Sodium Dichromate as a inhibitor produce a non-compliant RHOS part they are suggesting that there is a tiny amount of chrome at the atomic level left on the surface. Is there is some other substance to use as a inhibitor? citric acid is not suitable for their application. Does the Sodium Dichromate serve any other purpose other than a inhibitor.

Michael Lowden
Anodizing/Plating - Eugene, Oregon, U.S.A.
2006

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