No passwords, No popups, No cost, No AI:
we earn from 'affiliate link' purchases, making the site possible

Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

finishing.com -- The Home Page of the Finishing Industry

  The authoritative public forum
  for Metal Finishing since 1989

-----

Black coated brass nuts

2007

We manufacture switch seals that have brass nuts overmolded with silicone rubber. The brass inserts have to be black in color. The "black zinc" coating discolors having been exposed to 350 °F (molten rubber). "Black oxide" does not seem like a viable option due to economic constraints. Can you advise on any other method of making these inserts black as applicable to our process?

Thank you in advance

Alex Blakeman
- Towaco, New Jersey

Try black chrome, or ammonium/copper carbonate ⇦ this on eBay or Amazon [affil links] black patina for brass, or copper nitrate ⇦ this on eBay or Amazon [affil links] black (baked). Hope it helps and good luck!

Goran Budija
- Cerovski vrh Croatia
2007

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: