VCBLKHB-18 Blackening is a finishing operation that chemically coats the surface of ferrous materials. It creates a strong barrier against humidity and corrosion. Blackening is usually done in a batch operation. Generally, it is less expensive than other finishing options such as painting and plating.

VCBLKHB-18 Blackening uses a chemical compound that clings to the surface of machined metal (in all the nooks and crannies). It creates a porous base that bonds chemically with the workpiece surface. In cold blackening, that chemical compound is copper/selenium (CuSe).

Aside from aesthetics — it does make parts look nice — the black deposit on the workpiece is actually a means to hold a sealant, which is the business end of blackening.

The sealant (usually oil) finds its way into the pores of the black oxide coating where it is held in close contact with the metal substrate. It's the oil that prevents corrosion from reaching the workpiece surface. Corrosion protection is a prime reason for blackening a workpiece. The black oxide finish that we see keeps the oil in place so the workpiece doesn't rust.


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