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Zn plating RoHS compliance

Zn plating with yellow passivation is treated as RoHS non compliant process where as Zn plating with Blue passivation is accepted for ROHS.
I would like to know the reason behind this.

Anand Risbud
Philips Electronics India Ltd - Pune, India
2007

You'll need to post the actual details of your situation rather than vague references to it to get a good answer, Anand, but hexavalent chromium is non compliant and some chromate conversion processes use hexavalent chromate. Good luck.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2007

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