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RoHS compliance

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Are Alloy aluminum ANSI 6061-T6 or 5052-H32 RoHS compliance ?

Abudra Mustafa
networks - San Jose, California

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As far as I can tell via the directive the material, as is,is RoHS compliant. If it has a chem. film containing Hex chrome it would not comply.

Drew Nosti, CEF Ladson, South Carolina

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January 24, 2011

Hello,
Have you got a conclusive reply on your question? I am also interested to find out if Chromium in 5052-H32 (above 0.1%) is Chrome VI and therefore makes it non-RoHS compliant.

Alex Sidorovsky
biosciences - San Jose, California, USA

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January 2, 2011

Hi, Alex

Any chromium within a metal alloy is itself metal, at oxidation state 0. The concern over hexavalent chromium is restricted to certain types of coatings. There is a chromic acid anodizing process that could leave chromic acid (hexavalent chrome) on the parts; there are chromic acid sealing processes that could leave hexavalent chrome on anodized parts; and there are hexavalent chromate conversion coatings that could leave hexavalent chrome on the parts.

But a metal itself does not contain hexavalent chrome, and there are anodizing processes and conversion coating processes available that leave it hexavalent-free and RoHS compliant. When you send the parts out for finishing, do not specify chromic acid anodizing or a chromic acid seal, and do specify "RoHS compliant".

Regards,

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