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Since the process simply converts the surface chemically into Magnetite by a chemical reaction, there is virtually no dimensional change to the surface. No more than 5 to 10 millionths of an inch are added to the dimension of a part, which is comparable to the depth of penetration. Unlike painted of plated surfaces, this process provides corrosion resistance for critical sized parts. Is that cool or what?
Can provide up to 144 hours of salt spray exposure with the proper post-process rust preventative treatment.
There is no other process that can produce these sort of properties and characteristics for a lower price!
Depending on the hardness of the part and the black oxide bath temp chosen, deep black glossy to matte finishes can be achieved that are desirable from a variety of industries from architecture to aerospace! It should also be noted that it will resist color change up to 900'F.
The post-process treatment with rust preventative creates lubricity for mating parts.
The outer lubricated layer serves as the sacrificial surface during initial contact creating an ideal break-in surface for mating parts while work hardened surfaces are formed. The black oxide surface has a hardness of 5.5 on the Mohs’ Scale.
No hydrogen embrittlement occurs with black oxide...unlike plated and painted parts that are acid etched.
Black Oxide is an outstanding prep for surfaces to allow paint and other finishing to adhere better.
Black oxide coating is suitable for electrical parts as they do not reduce conductivity more than 1%.
Unlike paint and plating, black oxide does not produce harmful fumes when welding.