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Is Zinc Plate with Sodium dichromate finish RoHS compliant?

June 11, 2008

While doing Zinc plate with Sodium dichromate finish, is it RoHS compliant.

Sudhir Kulkarni
Designer - Bangalore, Karnataka, India

June 11, 2008

Hi, Sudhir. Dichromate is Cr₂O₇^-2. The chromium is in hexavalent state and is forbidden by RoHS. However, RoHS-compliant "chromates" are widely available (I put "chromate" is quotes because they are called trivalent chromate but are not really "chromate" because that is chemically CrO₄^-2).

Regards,

Ted Mooney, P.E.
finishing.com
Brick, New Jersey

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