Aluminum profile powder coating is a surface treatment method for aluminium profiles. Essentially, it uses electrostatic treatment to attach solid powder to the surface of aluminium profiles, and then forms a hard surface film through high temperature. This surface film has a good appearance and strong corrosion resistance, which is deeply loved by people. Therefore, powder coating is widely used in various aluminium profiles, Such as Aluminum Solar Profiles , Aluminum Profiles Heat Sink and Automotive Aluminum Profiles , etc.
Why is aluminum profile powder coating necessary?
Corrosion resistance
The surface film formed by powder coating on aluminum profiles can isolate the aluminum profiles from moisture and air in the environment, preventing chemical reactions from occurring on the aluminum profiles themselves and significantly extending their service life.
Beautiful and colorful
The aluminum profile powder coating offers a wide range of aesthetic colors. Unlike anodizing and electrophoretic painting, the powder coating has almost no restrictions on the available colors, including those from the RAL color chart, metallic colors, natural colors, etc. Moreover, the surface after treatment is very smooth, presenting an elegant and high-end visual effect. It can adapt to the vast majority of application scenarios. Therefore, powder coating is one of the most commonly used surface treatment methods.
Environmentally friendly
Unlike paints, heavy metal coatings, and polyurethane coatings, the powder coating used here is an eco-friendly material, consisting of 100% solid components and generating no volatile substances. Moreover, the powder coating process is low energy-consuming, and the recovery rate of the coating after treatment can reach up to 90%.
UV-resistant
The surface film of powder coating is relatively hard, which can effectively prevent the appearance from being affected by bumps and knocks during use, especially in places where bumps and knocks are hard to avoid, such as doors and windows, skirting boards, decorative strips, and aluminum alloy handles in public places.
Camouflage
For aluminum profiles with defects such as extrusion lines, scratches, bubbles, pockmarks, color differences, etc., powder coating on aluminum profiles can also cover the defective parts to make the flaws disappear, which can increase the yield of finished products.
The main material composition of aluminum profile powder coating
The selection of materials for powder coating is very important, whether it is self-production or purchasing finished aluminum profiles, because the composition of the coating can greatly affect the anti-corrosion performance, physical scratch resistance, appearance, etc. Choosing harmful coatings can also lead to safety hazards.
The raw materials for coating mainly include:
Resin: It determines the hardness and UV resistance of the surface of aluminum profiles and is the core material of the coating. It can determine various appearance shapes of surface treatment, such as smooth, sand-textured, and high-gloss.
Pigments: They can determine the color, UV resistance and surface gloss of the surface coating. They include organic pigments, inorganic dyes, metal salts and other substances, etc.
Curing agent: A curing agent is a substance that reacts with resin to transform the powder state of the material into a solid state. It can also affect heat resistance and weather resistance.
How to perform aluminum profile powder coating?
Powder coating steps
Fixing aluminum profiles on the rack: Manually fix the aluminum profiles on the rack. Secure one end of the aluminum profile to the traction machine, and be careful to avoid any bumps or knocks.
Cleaning: Clean the impurities, oil stains and other mixtures on the surface of the aluminum profiles in advance to avoid affecting the quality of the spraying.
Pre-treatment: Using a dedicated pre-treatment solution enhances the adhesion of powder coatings, increases the adhesion rate, and improves the spraying efficiency.
Electrostatic adsorption: The aluminum profiles are connected to the positive terminal through suspension. The negative powder is sprayed out by the electrostatic powder spraying machine. The positive and negative poles attract each other, and the powder can be adsorbed on the aluminum profiles. The process is automatically carried out by the machine. Although most of the powder will fall off, it can be basically recycled later and will not be wasted.
Curing: The powder adhered to the surface of the aluminum profile needs to undergo a curing process to form a surface film. The principle is that through a high-temperature process, the powder melts and solidifies.
Quality inspection: A qualified coating should have an even distribution of paint, uniform thickness, no particle defects, and no color differences. It mainly includes appearance inspection, film thickness inspection, and corrosion resistance testing.
Select an aluminum profile powder coating supplier
Shenghai Aluminium has accumulated ten years of experience in powder coating. We have a complete production line covering raw materials, coating, and packaging, with a total of seven lines. We accept custom orders for aluminium profiles, and our Aluminum profile products cover various types, mainly including aluminium doors and windows, aluminium trim, aluminium skirting boards, Aluminum Solar Profiles , Aluminum Profiles Heat Sink, Automotive Aluminum Profiles and aluminium furniture, etc. We also offer reliable powder coating technology. We believe that we can become your trusted long-term partner.
