Powder Coating Finishes for Aluminium Extrusions

Powder coating is one of the most popular finishes for aluminium extrusion. It is popular because of its durability and versatility. Powder coating is appropriate for both domestic and commercial applications. It can be used to protect your aluminium extrusion from corrosion, scratching, and exposure to the sun.

The Process of Powder Coating Aluminium Extrusions

The process of powder coating aluminium extrusions involves three major steps. All the steps need to be followed carefully to achieve the best results. The three steps are as follows;

  • Pre-Treatment

This is the first step in the process of powder coating. If it is not done correctly, the quality and durability of your end product may be compromised. In this stage, dust and other particles are removed from the surface of your aluminium extrusion through approved chemical and mechanical methods. If there are particles on the surface, your powder coating may fail to adhere properly.

  • Application

After the process of pre-treatment, it is time for powder application. It is applied using an electrostatic spray gun. The powder uses a positive charge to bond to the extruded products. The product is grounded as well. There are various spray nozzles in the market and each one of them is unique. The type of nozzle used depends on the type of workpiece and the consistency of paint to be used. Even though the use of an electrostatic spray gun is the most popular method of application, it is not the only one. Other powder coating methods include the use of electrostatic discs, fluidized bed, and electrostatic magnetic brush.

  • Curing

This is the final stage of powder coating. Your aluminium is heated allowing the powder to melt into a uniform film. It is usually heated in an oven at a specific temperature for a specific duration. It is then cooled resulting in a hard coating. In some cases, the metal may be heated before applying the powder coating. This makes it possible to achieve a uniform finish.

Electrostatic Fluidized Bed Coating

This method of application uses the same techniques as the conventional fluidized bed dip. An electrostatic charging medium has to be placed in the bed to ensure that the powder material is charged as the fluidizing airlifts it. The charged powder particles form a cloud of charged powder at the top.

Electrostatic Magnetic Brush Coating

This method is used to coat flat materials. The powder is applied onto the surfaces using a roller. It is a great option when you are looking for accuracy and high speeds. The layers may be between five and 100 micrometers.

Powder coating does not involve the use of liquids so the coatings are thicker than traditional liquid coatings. Powder coating is popular because it does not run or sag. It looks good and lasts long even when your aluminium extrusion is exposed to harsh weather conditions. It emits very few volatile organic compounds so it is good for the environment.

Contact a professional company such as Edmo for your aluminium extrusion needs. Always choose a company they can tailor their services to your needs.