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1. Definition and function of chemical pretreatment

Chemical treatment of aluminum surface can effectively remove oil stains, pollutants and natural oxide film on the original aluminum surface, so that the aluminum surface can be wet and clean.

2. General process flow of chemical pretreatment

Common chemical pretreatment methods include degreasing, alkaline washing, ash removal, fluoride sand surface treatment, water washing, etc.

3. Principles and functions of degreasing

In the acid pickling solution, the oil is hydrolyzed to produce glycerin and corresponding high-grade fatty acids. With the help of a small amount of wetting agent and emulsifier, the oil is more soluble and the degreasing effect will be improved. After degreasing treatment, grease and dirt on the aluminum surface can be removed, so that the alkaline washing in the later stage will be more uniform.

4. Principle and function of alkaline washing

The aluminum material is put into a strong alkaline solution with sodium hydroxide as the main ingredient for the corrosion reaction to further remove surface dirt, completely remove the natural oxide film on the aluminum surface, and expose the pure metal matrix for subsequent anodizing treatment.

5. Ash removal principle and function

After alkaline washing, there is usually a layer of metal compounds and their alkaline washing products that are insoluble in alkaline washing solution on the surface of the product. They are a layer of gray-brown or dark gray ash. The purpose of ash removal is to remove this layer of ash that is insoluble in the alkaline solution, to prevent contamination of the tank solution during the subsequent anodizing process.

6. Principle and function of fluoride sand surface treatment

Fluoride sand surface treatment is a type of acid etching process that uses fluoride ions to produce highly uniform and high-density spot corrosion on the aluminum surface.

The purpose is to remove the extrusion marks on the surface of the product and form a flat surface. However, due to the serious environmental pollution of the fluoride sand surface treatment process, it has not been widely used.

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