Blackening Process of Steel

Principle

Blackening treatment is to form a black oxide film on the metal surface through chemical treatment. This oxide film can provide corrosion protection, increase beauty and improve certain mechanical properties.

Metal blackening agents usually contain ingredients such as alkaline substances and oxidants. These ingredients react chemically with the metal surface at a certain temperature to produce black ferroferric oxide or other black oxides. Specifically, the metal reacts with the chemical components in the blackening agent to form a black oxide film.

High-temperature blackening process

High-temperature blackening of steel is carried out by immersing steel parts in a strongly oxidizing chemical solution under boiling conditions. The reaction generates a beautiful, dense and rust-proof black iron oxide film (ferroferric oxide). The thickness of this film is about 0.5-1.5 microns, which has good wear resistance and rust prevention effects.

Before blackening treatment After blackening treatment

High-temperature blackening process - advantages and disadvantages analysis

1. Good rust prevention ability, can effectively protect the inside of steel from oxidation.

2. Good wear resistance, suitable for protection and decoration of various mechanical parts.

3. Beautiful, dark and shiny appearance.

4. Heating equipment is required, and the operation is relatively complicated.

5. High energy consumption, high temperature blackening process consumes a lot of energy and has low efficiency.

6. Environmental pollution, harmful gases and wastewater will be generated during the treatment process.

7. Heating may cause thermal deformation of the workpiece, which is not suitable for parts with very high dimensional accuracy requirements.

Application scenarios

Widely used in the protection and decoration of various mechanical parts, precision instruments, cylinders, springs, weapons and daily necessities. Due to its good anti-rust and aesthetic effects, it is also often used in occasions requiring high protection requirements.

Room temperature blackening process

It is a chemical process for blackening the surface of steel at room temperature. This process can form a dense black oxide film on the surface of steel, enhance the anti-corrosion and aesthetic effects, and is widely used in the surface treatment of steel parts in industrial sectors such as mechanical parts, standard parts, process products, springs, etc.

Room temperature blackening process - advantages and disadvantages analysis

1. Save energy, room temperature blackening does not require electricity.

2. Improve work efficiency and shorten processing time.

3. Low cost, simple equipment and easy operation.

4. No special requirements for the type of steel, steel parts with different carbon content and surface state can obtain consistent color effects.

5. Strong corrosion resistance, the surface of the workpiece is stable after blackening.

6. Environmental protection, no pollution, no emissions, simple operation.

Application scenarios

Widely used for surface treatment of various steels, suitable for steel parts processing enterprises in industrial sectors such as mechanical parts, standard parts, process products, springs, etc.