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Need RoHS Compliant Black Oxide





June 4, 2012

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 5, 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



First of two simultaneous responses -- June 7, 2012

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

John Andrews
- Murphy, North Carolina, U.S.A.



Second 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


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