Complete List of Aluminum Surface Treatment Process

 

First, chromating

Chroming will form a chemical conversion film on the surface of the product, the thickness of the film is 0.5-4um, this conversion film has good adsorption, mainly as a coating base layer. The appearance is golden yellow, aluminum color, green, etc. This conversion film has good electrical conductivity and is the best option for electronic products, such as conductive strips in cell phone batteries, magnetic devices, etc. The film is suitable for all aluminum and aluminum alloy products. However, the conversion film is soft and not wear-resistant, so it is not conducive to be used as external parts of products.

 

Second, anodic oxidation

Anodic oxidation: It can make the product surface form a uniform and dense oxide layer, and this film can make the surface hardness of the product reach 200-300HV.
In addition, this product has very good wear resistance, and can be used as a mandatory process for aviation and aerospace related products. The difference between anodic oxidation and hard anodic oxidation: anodic oxidation can be colored, and the decorative properties are much better than hard oxidation.

 

Third, aluminum plating

Electroplating has the advantages of good electrical conductivity, fast heat transfer, light specific gravity, easy to shape, etc. However, aluminum and aluminum alloy have the disadvantages of low hardness, no wear resistance, easy to intergranular corrosion, not easy to weld, etc., which affect the scope of use. Therefore, in order to avoid the shortcomings, the modern industry has solved this problem by using electroplating.
As aluminum is a relatively active metal, the electroplated materials are more active than aluminum, therefore, before plating, must do the corresponding chemical transformation, such as zinc dip, zinc-iron alloy, zinc-nickel alloy, and make zinc and zinc alloy base layer has a good bonding of the intermediate layer of cyanide copper plating layer. Die-casting aluminum due to the loose structure of the body, grinding, can not polish off the surface part of the body, otherwise pinhole, spit acid, peeling and other phenomena.

 

Fourth, coating of aluminum

Coating is divided into dip coating, spraying, drenching, rolling and brushing, etc. Among them, dip coating and spraying are mainly used. Dip coating is also known as electrophoretic coating, which uses electrochemical methods to deposit organic resin particles on the surface of the workpiece to form a transparent or various colors of organic coating. Among them, cathodic electrophoresis is a new process developed in the seventies and is the main process in the dip coating industry. The advantages of good corrosion resistance, strong resistance to discoloration, good bonding characteristics. Spraying is divided into powder coating and liquid coating, of which electrostatic coating is the more popular process in the industry at present.

 

Fifth, chemical plating

Chemical plating is a plating method in which metal ions are deposited on the surface of the parts by means of redox in the same solution with the help of reducing agents when no current is passed (no external power). Therefore, chemical plating can be described as a controlled, autocatalytic chemical reduction process for depositing metals. Compared to other coating methods, chemical plating has the following characteristics.
It is possible to coat parts made of various materials such as metals, semiconductors, and non-conductors with metal.
Regardless of the complexity of the part geometry, uniform thicknesses can be obtained wherever the solution is accessible.
For autocatalytic chemical plating, larger thicknesses can be obtained and even electroformed.

 

Sixth, electrophoretic treatment

Color electrophoretic coating of aluminum is a novel surface treatment process. It uses electrochemical methods to deposit colloidal particles of organic resins on the parts to form a transparent or variously colored organic coating layer. According to the ionization of resin particles in the electrophoretic paint, it can be divided into anodic electrophoresis and cathodic electrophoresis.
The corrosion resistance of the electrophoretic coating layer is extremely good, and the resistance to discoloration is strong; the bonding with the base metal is good, and various mechanical processes can be performed.

 


LITONG is an enterprise specialized in designing and manufacturing Environmental Protection Production Line, Aluminum Composite Panel Laminating Line (ACPL), Aluminum Color Coating Line (ACCL), Steel Color Coating Line (SCCL), Continuous Aluminum Anodizing Color Coating Line and so on. Please contact us if you need to build your coating line.

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