Blackening

DWJ Narzędziownia CNC

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Blackening of metals – noble patina for durability and aesthetics

Metal blackening, also known as oxidation, is a surface treatment process that produces a thin layer of oxides on the metal surface. This protective coating gives the metal a characteristic dark colour, ranging from black to brown, and significantly improves its performance properties.

What is metal blackening?

In the blackening process, the metal is exposed to oxidising substances that react with the metal surface to form oxides. Depending on the type of metal and the desired effect, different blackening methods are used, such as:

Chemical blackening: The metal is immersed in a chemical solution that causes oxidation of the surface.
Electrolytic blackening: The process takes place in an electrolytic bath, where the metal is connected to the positive pole and a layer of oxides is formed on the surface.
Thermal blackening: the metal is heated under controlled conditions, leading to the formation of oxides on the surface.

Advantages of metal blackening:

Corrosion protection: The oxide coating acts as a protective barrier, preventing oxidation and corrosion of the metal.
Hardness enhancement: The oxide coating increases surface hardness, improving abrasion and wear resistance.
Improved adhesion: The coating improves the adhesion of paints, varnishes and other protective coatings.
Aesthetic effect: The dark matt surface gives the metal an elegant appearance.

Applications of metal blackening:

Mechanical industry: Bushings, pins, plates.
Defence industry: Blackening of firearms to protect against corrosion and improve appearance.
Automotive industry: Blackening of decorative parts such as mouldings, emblems.
Furniture industry: Blackening of metal parts of furniture, e.g. feet, handles.

Why choose metal blackening?

Metal blackening is a process that produces durable and aesthetically pleasing metal products. Thanks to its properties, blackening is widely used in many industries.