Powder coating process begins with the preparation of the metal surface by sandblasting, grinding, or chemical cleaning in order to remove oil, dirt, rust, or other contaminants. This will ensure that the coating adheres effectively to surface of the metal components.
After choosing the color of the powder, it is sprayed on to the metal surface using an electrostatic gun.
The charged powder particles adhere to the electrically grounded surfaces of the parts. Subsequently, the parts are baked in an oven at 200 °C (392 °F) for 20 minutes. This will cause the powder to melt and fuse with the metal surface. Upon cooling, the coating becomes hard, durable, and consistent on the surface of the metal. It is resistant to chipping, scratching, fading, and wear, which is why it is often used on items that are exposed to harsh conditions and intensive use.
Typical coating thickness ranges from 60 to 80 µm.
In addition to its performance advantages, powder coating is also known for its environmental friendliness. Unlike traditional liquid paint, it doesn't contain harmful solvents and volatile organic compounds (VOCs) that can be harmful to the environment. As a dry powder, it can be collected and reused, minimizing waste.
Additionally, the overspray can be recycled, which means virtually all the powder can be used, reducing costs and environmental impact.
Powder coated items are used across numerous industries, including automotive, aerospace, home appliances, furniture, and construction. It's available in a vast range of colors and finishes, making it a popular choice for manufacturers and consumers alike.
