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Need RoHS Compliant Black Oxide




Q. We are presently utilizing Black Oxide per MIL-C-31924, Class 1 over carbon steel (AISI 1026 and 1141). We have determined that this material is not ROHS compliant. Because these components are used in ROHS compliant products, we are seeking black oxide coating which is RoHS compliant.

John Andrews
- Murphy, North Carolina, United States of America
June 4, 2012


A. Hi John. That surprises me. Can you tell us what is in the black oxide coating that is not RoHS compliant?

Regards,

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Ted is available for instant help
or longer-term assistance.
June 5, 2012


A. The material which makes the black oxide per MIL-DTL-13924 [⇦ this spec on DLA] non compliant with ROHS are the hexavalent chromium by products from the chromic acid dip.

John Andrews
- Murphy, North Carolina, U.S.A.
First of two simultaneous responses -- June 7, 2012


A. Ted

If performed to the specification, the Class 1 (& 2)finish receives a chromic acid dip, and allowed to dry without subsequent rinsing.

John

Perhaps your customer would consider an exception to the chromic acid dip for this application.

Willie Alexander
- Colorado Springs, Colorado
Second of two simultaneous responses -- June 7, 2012




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