Aluminium extrusions are widely used in various industries due to their lightweight, strength, and ease of fabrication. They are commonly used in the construction industry, automotive industry, and aerospace industry, to name a few. One of the main advantages of using aluminium extrusions is their ability to be easily powder coated. Powder coating on aluminium extrusions not only provides a great finish but also enhances their durability and resistance to corrosion.
The powder coating process involves three main steps: pre-treatment, powder application, and curing. In the pre-treatment stage, the aluminium extrusions are cleaned, degreased, and chemically treated to improve the adhesion of the powder coating. The powder is then applied using electrostatic guns. The charged powder particles are attracted to the grounded aluminium extrusions, ensuring even coverage. The coated extrusions are then cured in an oven to fuse the powder coating onto the surface.
There are two main types of powder coatings: thermosetting and thermoplastic. Thermosetting powder coatings are essentially epoxy resins that cure when exposed to heat. This type of powder coating provides excellent corrosion resistance and durability. They are commonly used in harsh environments such as marine and industrial applications. Some of the grades of thermosetting powder coatings include epoxy, FBE, epoxy-polyester, architectural polyester, hybrids, polyester, super durable polyester, and polyurethane.
Thermoplastic powder coatings, on the other hand, do not undergo a chemical reaction upon curing. They are simply melted and re-solidified upon heating and cooling. This type of powder coating is commonly used for decorative applications as it provides excellent color retention and glossiness. However, thermoplastic powder coatings are not as durable as thermosetting powders.
Powder coated aluminium extrusions have numerous advantages over other surface finishing options. The finish of powder coating is significantly smoother and more uniform than traditional paint finishes. The coating is also thicker, providing better protection against scratches and wear. Aluminium extrusions that are powder coated are also more resistant to chipping, fading, and peeling. Because of their smooth surfaces, powder coated aluminium extrusions are easier to clean and maintain.
Powder coating also provides environmental advantages over other traditional finishes such as paint. Powder coatings are free of volatile organic compounds (VOCs) that can be harmful to the environment. Powder coatings can also be recycled, reducing waste and improving sustainability.
In conclusion, powder coating is an excellent surface finishing option for aluminium extrusions. It provides durability, aesthetic appeal, and environmental advantages over traditional finishes such as paint. The various grades of powder coatings available, such as epoxy, FBE, polyester, and polyurethane, make it possible to tailor the coating to specific applications. Powder coated aluminium extrusions are widely used in industries such as construction, automotive, and aerospace due to their lightweight, strength, and versatility.