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Need aluminum coating that is ROHS compliant

Need aluminum coating that is ROHS compliant

Need aluminum coating that is ROHS compliant

(OP)
We have a chassis that currently has aluminum sides with a clear iridite finish. We've been told that this finish can no longer be used in order to comply with the Restriction of Hazardous Substance (ROHS)directive in Europe. This directive says that any new electrical and electronic equipment must not contain lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBBs) or polybrominated diphenyl ethers (PBDEs). The coating we use needs to be conductive for EMI reasons and fairly durable. Clear is preferred for aesthetic reasons. Any suggestions on an alternate coating?

RE: Need aluminum coating that is ROHS compliant

Henkel makes some Alodine conversion coatings that are chrome free. North American phone is (800) 521-6895. They also have a website that is not particularily useful.
<www.hstna.com>

RE: Need aluminum coating that is ROHS compliant

(OP)
I found the answer to my question. Trivalent chromium. This is currently offered by Metalast under the name TCP-HF.

RE: Need aluminum coating that is ROHS compliant

Thanks for following up and sharing the wealth.

RE: Need aluminum coating that is ROHS compliant

If you are looking for corrosion protection, Trivalent is not as good as Hexavalent.  I've been researching alternatives to Chromic Acid Anodize, Type 1 for 7075-T6 aluminum parts and everything so far points to compromises when you switch.  Anyways, I would not limit myself to Trivalent alone.  There are alot of companies out there coming up with new (proprietary) coatings to get around RoHS...

RE: Need aluminum coating that is ROHS compliant

Also, check out this thread in Eng-Tips.  It may have some bearing for you:

Conductive coating on aluminium?

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