Powder coating is the application of an organic powder to metal using electrostatic attraction. The powder is then heat cured to a smooth hard finish. Let’s take a quick look at how the powder coating process works.
First up, the product that is to be powder coated needs to be sandblasted. Sandblasting helps remove any scale, oil, or rust that is often found on new steel. If the object is being repainted, sandblasting helps remove any old coatings or paint. Sandblasting also creates a profile in the metal surface that the powder will adhere to when it flows out in the oven.
Applying the Powder
Following sandblasting, the dry solid powder is applied using an electrostatic spray gun. The gun adds a positive charge to the powder particles, which attracts them to the negatively grounded object being sprayed. The electrostatic charge of the particles to the object helps minimize overspray, preventing uneven buildup, and leaving a smooth and even finish.
Baking the Object
Finally, the product is baked in an oven. At the manufacturer’s desired temperature and time for final cure ensure the powder coat flows out into a decorative, durable finish.