Electrophoretic coating process for aluminum alloy profiles

China Aluminum Network: Over the past 20 years, China's aluminum industry has developed into a comprehensive industrial system and has become one of the key pillars of the national economy. The production of primary aluminum has exceeded 2.5 million tons, ranking third globally. There are over 1,000 aluminum processing enterprises with a total annual capacity of 3.5 million tons, and the output of aluminum profiles reaches 1 million tons annually. Currently, the industry is entering a phase of high-end development. Surface treatment technology for aluminum profiles has advanced rapidly, evolving from simple bronze materials to powder coating, fluorocarbon spray, organic and inorganic dyeing, electrophoretic coating, and mechanical or chemical polishing. New technologies such as wood grain processing, three-stage electrolytic coloring, and micro-arc oxidation are also being tested. The appearance of aluminum profiles now includes colors like titanium, gold, champagne, and imitation stainless steel, along with special effects like mirror, sandstone, matte, and pearlescent finishes.

Among various surface treatment methods, electrophoretic coating stands out due to its versatility and performance. After anodizing and electrolysis, the aluminum profile undergoes electrophoretic coating, providing double protection. It offers high transparency, strong metal texture, excellent corrosion and weather resistance, and surpasses spray paint and powder coating in terms of aesthetics. This makes it highly popular in home decoration, with a huge market potential. Additionally, the process is easy to implement—only requiring a few additional tanks on the existing production line, making it environmentally friendly and safe. Electrophoretic coating lines have become a symbol of a plant’s technical capabilities, representing high-grade and luxurious aluminum profiles.

Electrophoretic coating was first introduced in the 1930s by Ford Motor Company for wheel coatings and has since seen rapid development. Transparent acrylic and polyurethane electrophoretic coatings became widely used in the 1970s for metal surface protection, especially for copper signs, stainless steel, and electroplated products. One of the most well-known applications is in architectural aluminum profiles.

Traditionally, aluminum profiles underwent oxidation, coloring, and sealing. However, the resulting conversion film is prone to corrosion and lacks durability, especially in harsh environments like acid rain or coastal areas. To address this, paint coating methods were introduced to enhance both aesthetics and service life. Today, industrial electrophoretic paint, powder coating, and fluorocarbon spraying are all successfully applied. Electrophoretic coating, being water-based, allows direct electrophoresis after pretreatment, offering high transparency and highlighting the natural metallic luster of aluminum. As a result, more and more profiles are being coated using this method.

Compared to other coating techniques, electrophoretic coating offers several advantages:

1. Easy automation: Performed in an aqueous bath, similar to anodizing and electrolytic coloring, it allows for quick processing and easy integration into assembly lines.
2. Uniform and dense film: High throwing power ensures even coverage on complex shapes, with thickness controlled via electrical parameters.
3. High paint utilization: Low viscosity reduces material loss, and water washing enables high recovery rates, reaching over 95%.
4. Safety and environmental friendliness: Water-based formulation reduces solvent content, eliminating fire risks and protecting workers’ health.
5. Superior quality: Acrylic resins combined with amino resins provide excellent decorativeness and corrosion resistance. The high transparency enhances the metal look and allows for matte, sand, or pearlescent finishes.
6. Time and labor saving: No need for sealing, avoiding defects caused by poor sealing processes.
7. Adjustable film thickness: Typically between 7 μm and 12 μm, depending on regional standards.
8. High-quality raw materials required: Since the coating is transparent, extruded materials must be smooth, defect-free, and carefully processed to avoid visible imperfections.
9. Strict process control: Ensures high yield and consistent quality throughout the electrophoresis process.

In summary, electrophoretic coating is not only a technologically advanced surface treatment but also a sustainable and aesthetically appealing choice that is gaining increasing popularity in the aluminum industry. Its combination of performance, efficiency, and environmental benefits positions it as a key trend in modern aluminum finishing.

Diaphragm For ASCO Pulse Valve

The category of diaphragm for ASCO pulse valve. The diaphragms are listed as follows:

ASCO Pulse Valve Diaphragm, ASCO Diaphragm, ASCO Diaphragm Kit, ASCO Pulse Valve Membrane

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