What are the differences between Dalian blackening surface treatment and other surface treatment methods?

Dalian blackening surface treatment is a commonly used surface treatment method, which can increase the aesthetics, durability, and corrosion resistance of objects by forming a black oxide film or blackening film. The principle mainly includes chemical blackening, thermochemical blackening, and oxidative blackening. Blackening surface treatment has a wide range of applications in decoration, industrial products, and other fields, providing effective technical means for product enhancement and improvement.

Chemical method is achieved by applying a special coating or solution to the surface of an object to achieve a blackening effect. Common chemical methods include acid washing, oxidation, and vulcanization. Acid washing method refers to the method of soaking an object in strong acid to generate a layer of oxide or sulfide on its surface. Oxidation method refers to the process of blackening an object through the formation of oxides, commonly used oxidants include oxygen, manganese dioxide, and copper dioxide. The sulfurization method is achieved by coating a layer of sulfur-containing substance on the surface of an object to generate a layer of sulfide, thereby achieving the effect of blackening.

What are the differences between Dalian blackening surface treatment and other surface treatment methods?

Different appearance effects: The blackened surface treatment can make the material surface appear black or dark brown, creating a unique aesthetic and texture. However, other surface treatment methods may cause the material to appear in different colors, such as chrome plating, spraying, etc.

No coating required: Unlike many other surface treatment methods that require coating, blackened surface treatment mainly generates a layer of carbide or oxide on the material surface through physical or chemical methods, thereby changing the color and luster of the material. This makes blackening surface treatment more economical and environmentally friendly.

Corrosion resistance: Blackening surface treatment can improve the corrosion resistance of materials, especially for metal materials such as stainless steel, which can effectively extend their service life. However, other surface treatment methods such as electroplating and spraying may achieve certain anti-corrosion effects, but their anti-corrosion performance may be slightly inferior.

High temperature performance: Blackening surface treatment is commonly used to improve the high-temperature stability of materials. By forming a stable oxide layer on the surface of the material, it is possible to maintain stable performance and extend its service life in high-temperature working environments. Other surface treatment methods may not provide the same high-temperature stability performance.

The principle of blackening surface treatment is mainly achieved by forming a layer of black oxide film or blackening film on the surface of an object. Generally speaking, the oxidation reaction on the surface of a metal object is the oxidation reaction between the surface metal and oxygen, generating oxides. By blackening the surface treatment, a dense and thick oxide film can be formed on the metal surface, thereby improving the corrosion resistance of the object.

The physical method achieves the effect of blackening by changing the surface structure of an object. The commonly used physical methods include sintering method and black plating method. Sintering method refers to the method of heating the surface of an object to a certain temperature to sinter its surface oxides or sulfides into a dense black film. The black plating method involves depositing a layer of black metal film, such as brass, nickel, etc., on the surface of an object to give it the effect of starting black.