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topic 32229

RoHS -- is the chromium in 6061 / 5052 aluminum hexavalent?


Q. For the purposes of the New EU Directives and RoHS compliance, a maximum concentration value of up to 0.1% by weight in homogenous materials for hexavalent chromium will be permitted in the manufacture of new EEE.

Is the Chromium (Cr) found in 6061-T651, 5052-H34 or other common Al alloys hexavalent form? (please refer to for aluminum specs)

Costa Christopoulos
RoHS & WEEE - Montreal, Quebec, Canada


A. No, the Cr is not present in the hexavalent ion form when it is alloyed with Al, steel, etc.

Toby Padfield
Automotive module supplier - Michigan

July 3, 2014 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread

Q. Currently we are specifying MIL-A-8625 Type II for an anodize finish on 5052-H32 and 6061-T6 aluminum components in order to meet RoHS compliant requirement. A question comes up that whether 5052 or 6061 themselves are RoHS compliant because of the amount of chromium in the base alloy material. I understand that there are 3 types of chromiums - zero valent, trivalent and hexavalent. Can anyone tell me what type of chromium is inside 5052 and 6061 alloys and if they are RoHS compliant? Thank you very much.

Jacky Yam
- Hazelwood, Missouri, USA

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