Aluminum electrophoretic coating technology

[China Aluminum Industry Network] After the development of the aluminum profile industry in China for 20 years, it has become an intact industrial system and has become one of the pillar industries of the national economy. The output value of primary aluminum has reached more than 2.5 million tons, accounting for the third place in the world. It has more than 1,000 aluminum processing companies, the production capacity has reached 3.5 million tons/year, and the output value of aluminum profiles has reached 1 million tons/year. At present, it has entered the period of high-end development. The development of aluminum profiles has been rapid. It has been developed from a single bronze material to a powder coating, spray-painted fluorocarbon coating, organic and inorganic dyeing, electrophoretic coating, mechanical and chemical polishing. The wood grain processing skills, three-stage electrolytic multicolor and micro-arc oxidation coloring skills are also in trial production. The appearance of aluminum profiles is titanium, gold, champagne, imitation stainless steel and various colors, as well as the appearance of mirror Sandstone, matt, pearlescent and other special effects. Electrophoretic coating is a more applicable skill in the development of many surface treatment skills. Aluminum anodized and electrolytically painted and then electrophoretic coating, there are double maintenance. With high transparency, high metal texture, high corrosion resistance and high weather resistance, it is more decorative than spray painting and powder coating. It is deeply loved by users and has been widely used in home decoration. The potential shopping mall is extremely large. Second, the technology is simple to implement, as long as the addition of several grooves in the original production line and aluminum oxide coloring constitute pipeline production, water-soluble electrophoretic coating security, can complete closed loop, is conducive to environmental protection. Third, it is more important that the electrophoretic profile is more attractive and is a model for high-grade and luxurious profiles. Having an electrophoretic coating line becomes an important symbol for induction of the skill level of the aluminum plant.

Electrophoretic coating of aluminum profiles

Electrophoretic coating features

Since the application of electrophoretic coatings in Ford Motor Company's wheel coating line in the 1930s, its application has been rapidly developed. Bright, weather-resistant acrylic and polyurethane electrophoretic coatings have been successfully used in the decoration and maintenance of metal exteriors since the early 1970s, such as the maintenance of copper signs, the decoration and maintenance of stainless steel and electroplated products, as a final maintenance of the decoration layer. More representative is the electrophoretic coating of aluminum profiles.

The traditional appearance treatment technology of aluminum profile is oxidation, coloring, and closure treatment. The conversion film of this aluminum material is used in long-term outdoor use, especially in acid rain or marine environments. It is easy to erode and has poor durability. Therefore, since the 70s, At the beginning, everyone tried to use coating methods to improve the decoration performance and the service life of aluminum profiles. Currently, electrophoretic painting, powder coating, and fluorocarbon spraying have been used successfully in industrialization. Because the electrophoretic coating is a water-based coating, the aluminum material can be directly electrophoresed after being washed in the pre-treatment. The electrophoretic coating has a high degree of transparency, and has both a high decoration and excellent metallic luster of the aluminum profile. Therefore, the aluminum profile has been increasingly increased. Use electrophoretic coating.

Electrophoretic coating and other coating methods have the following advantages:

(1) Easy to automate production. Because the electrophoretic coating is performed in an aqueous electrophoresis tank, similar to the anodizing and electrolytic coloring techniques, the treatment time is short, and the entire technology pipeline work is simply completed.

(2) The coating film is even and dense. Because the electrophoretic coating has a high throwing power, uniform shapes can be obtained even for complex shapes, and the film thickness can be manipulated by adjusting the amount of electricity together.

(3) The use of paint is high. Because the viscosity is low, the workpiece is brought out less, and the electrophoresis workpiece can be washed with water. The use of the retraction device makes the electrophoretic coating use rate as high as 95%.

(4) Safety and environmental protection. Because the electrophoretic coating is diluted with water, the solid content is low, and the solvent content is low, it is an environmentally friendly coating, and the risk of fire is eliminated, and the health of workers is also guaranteed.

(5) The coating quality is good. Acrylic resin is cured with amino resin, which ensures high decoration and high corrosion resistance of the coating film. Because the resin is highly transparent, it effectively excels in metal texture, and can also be decorated with matt, sand, pearl, etc. as required.

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