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Durable matte black plating for an already plated cast Aluminum D-Sub connector shell

Q. Can anyone suggest a durable matte black plating for an off the shelf D-Sub connector shell?
The shells are made of cast Aluminum with zinc plating and followed by a blue-toned chromate conversion coating.

Reuben Sandler
Mechanical Engineer - Berkeley, California, USA
January 11, 2012

Strip the chromate and the zinc then anodize and dye black.
Guillermo Marrufo - Monterrey, Mexico

Guillermo Marrufo
Monterrey, NL, Mexico
January 17, 2012

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