Lighting powder coating is a technique for applying a dry, solid film of polymeric particles to a substrate. Powder coatings are typically applied over an existing finish, such as paint or primer, and then cured under heat lamps. Powder coatings provide excellent corrosion protection and durability, and achieve vibrant colors, high gloss levels, and depths of color clarity. While strengthening the functionality of the lighting fixtures, it also adds more aesthetic feeling.
The Powder Coating Process
The powder coating process is a fairly simple one. First, the parts to be coated are cleaned in an ultrasonic cleaner, then degreased and dried with compressed air. The substrate is then pre-heated to the proper temperature before it’s dipped into an electrostatic bath where it’s sprayed with a thin layer of polyester or polyurethane powder followed by a liquid binder. The part goes back under high heat at this point in order for the powder and binder to fuse together on the surface. Once this has been accomplished (usually within two minutes), your part can be baked in an oven at 400°F (205°C) until it reaches its final hardness (usually around three hours).
Pretreatment for Powder
The most important step toward a successful powder coating is proper preparation of the surface. This process begins with cleaning your metal with a solvent or degreaser to remove any dirt or grease. Next, you’ll want to use a scrubbing pad to remove any remaining oil and grease from the surface before washing it with water, then drying it thoroughly before continuing with your powder coating process.
Powder Coating Stage
When you walk into the powder coating stage, you will see there are many different types of spray guns used for this process, but they all use high-velocity air streams to apply the powder. The air is forced through a nozzle that has been designed to produce a very fine atomized spray pattern. The size of these particles varies by the material being applied and the type of gun being used; however, they are typically small enough that they can be easily manipulated by wind currents in order to create an even coating on every surface being coated.
The powder coating process begins with the use of a spray gun to apply a primer coating to the object. The primer acts as an adhesive for the actual layer of powder that will be applied later on in the process. After this has been done, it is time for another spray gun to apply the actual layer of paint onto the object. This layer needs to be very thin so that it does not affect the appearance or function of whatever it is being applied on top of later on down the line (if you want something thicker than what might look good today).
Speaking of primer (white surface below is primer), some lighting products may not have primer, because it can save costs, and the surface will not be different for a while. However, the primer can significantly improve the adhesion and anti-corrosion function. Without the primer, no change can be seen in the short term, but the metal surface is prone to rust or paints peeling off after one year or even half a year. Moreover, Tonsda Lighting’s lighting fixtures are all attached with primer and passed the salt spray test to ensure the adhesion of the metal surface of the lamp.