Our Services - Finishes Detail

Black Oxide

Black Oxide Coating

Black oxide (blackening, oxidizing, black passivating, gun bluing), is a type of conversion coating process. Metals with a black oxide coating are dimensionally stable and have a matte black appearance. Unlike nickel or zinc electroplating, the black oxide is not deposited on the surface of the substrate. Instead, we create the black oxide coating via a chemical reaction between the iron of the ferrous alloy and the oxidizing salts present in the hot black oxide solution.

Benefits of Black Oxide Coating Are:

  • No dimensional changes
  • Does not chip or flake
  • Offers improved lubricity
  • Able to withstand high temperatures without discoloring
  • Can be welded
  • Offers cosmetic benefits (glossy or matte)
  • Inexpensive to apply
  • Does not induce hydrogen embrittlement


  • MIL-DTL-13924D

Capabilities and Related Services:

  • Rack and Barrel (bulk) plating
  • Regular and Touch Dry Oil
  • Salt spray testing
  • Stripping
  • Tumbling
  • Blasting
  • Packaging

Common Substrates:

  • Steel
  • Stainless steel
Services Image
Services Image
Services Image