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Product Updates - Black Oxide Cutters & New Grips

By Daniel Graef on May 31, 2017 at 04:07 PM in What's New

Black Oxide

Black Oxide or Blackening

Black Oxide, blackening, oxidizing, oxiding, black passivating, gun bluing . . . these terms all refer to the process of forming a black iron oxide on the surface of ferrous metals.

The black oxide process is a chemical conversion coating. This means that the black oxide is not deposited on the surface of the substrate like nickel or zinc electroplating. Instead, the black oxide coating is produced by a chemical reaction between the iron on the surface of the ferrous metal and the oxidizing salts present in the black oxide solution. These oxidizing salts include penetrates, catalysts, activators and proprietary additives which all take part in the chemical reaction. The result of this chemical reaction is the formation of black iron oxide, magnetite (Fe3O4), on the surface of the metal being coated.

  • Reduced Light Glare – Hand tools, and surgical instruments coated with black oxide reflect less light and reduce eye fatigue when used under bright lights.
  • Corrosion Protection – Depending on the post-treatment applied, black oxide coating can give corrosion resistance equivalent to 144 hrs of salt spray exposure. Other applications are designed to provide extended shelf life for stored parts prior to their use or to prepare them for further surface treatment (painting).
  • Improved Lubricity – Oil post-treatment not only protects against corrosion, but the oil itself results in smoother running, mating parts.

Conductivity –Black oxided parts experience no more than a 1% reduction in conductivity, making it a suitable treatment for electrical parts.