Black oxidation

Black oxidation – protection of technical details

Black oxidation (blackening) is the formation of a black oxide film (thickness 6-8 micrometres) on the surface of a steel product, which not only provides an aesthetic appearance but also enhances its properties and durability.

Tank dimensions (length/width/depth): 150x100x100cm.

What is black oxidation?

Black oxidation, also known as blackening, is a chemical process by forming a thin oxide layer on the metal surface. This layer imparts a black tone to the metal and provides additional protection.

Advantages of black oxidation

  • Protection: The oxide layer forms a protective barrier, shielding the component from corrosion and other external damages during use.
  • Quality: The metal component is thoroughly prepared for mechanism installation, saving time and ensuring quality.
  • Longevity: Treated parts, especially those within oil-operated mechanisms, experience enhanced durability.

How does metal oxidation occur?

To prepare steel components for treatment, the surface undergoes electrochemical processing to alter its relief and remove corrosion before treatment (pickling). Controlled black oxidation of steel or cast iron involves immersing the metal in a high-concentration alkali solution heated to 140 degrees Celsius, where the oxidation process takes place. As a result of this reaction, an oxide layer forms on the metal surface, giving the product a black colour and protective properties.


Black oxidation is widely used for technical components in engineering, including automobiles, ships, locomotives, and transmission gearboxes of vehicles. It is also applied to other technical items exposed to significant temperature fluctuations and sensitive to size changes after surface treatment.

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Black oxidation

Black oxidation prices

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