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Dichromate, Diecast 380 Aluminum? What is it really, RoHS compliant?

I have quotes from an oversees vendor and he states that my 380 aluminum parts will be "Dichromated" for finish to protect until I powder coat. What is this Dichromate coating and is it RoHS compliant? Also, is this acceptable to powder coat over?

Eric Hubbard
Electronics test manufacturer - Fishersville
2005

Dichromate coatings can be a good base for powder coating. Dichromate means Cr2O7--, so the chromium is hexavalent and inherently non-compliant. But it is also true that we call compliant trivalent coatings 'chromate', which actually means CrO4-- and thus implies hexavalent. --

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2005

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