The Secrets Of Successful Powder Coat Application

The metal finishing process known as powder coating has become almost indispensable towards modern assembly line production in industries which turn out metal products. Iron lawn furniture, steel bicycle frames, bar-b-q ovens, refrigerators, wheels, kitchen and microwave ovens, dishwashers, all of these are finished using the powder coat process for painting. Understanding the secrets of the process will help readers understand why.

The powders used in the coating process, which come in a wide variety of colors, are metallic and therefore can have an electromagnetic charge imparted to them during the spray application. The parts to be coated are electrically grounded. Thus, the powder electromagnetically adheres to the target surface. Because of this, and because the sprayers can be controlled to a high degree of precision, especially in an automated finishing line, it is far more possible to lay down even coats than is the case with standard liquid paint spraying. There is no pooling or uneven application, even in tight spaces and corners. And by using powder, the second advantage of this process comes into play.

When the coated part is removed from the booth for curing, the excess powder is sucked up and out by the booth’s own ventilators. This excess is then collected and put back into the reserve bottle for reuse. Thus, there is far less wastage of material than in standard liquid spray-down processes and cleanup after coating is a far easier job. This cuts down massively on toxic residues as well, which solves an environmental problem as well as the other problems connected with supply and cleanup.

The coated part is moved to a curing booth, where it is subjected to temperatures of up to 450°F. Under these conditions, the powder gels and flows to produce a totally smooth surface which is also corrosion-resistant and far less subject to scratching or flaking off if any one area becomes dented or is knicked in a minor impact. When the curing is completed, the part is then placed out to air-cool. No special treatment is required afterward, nor any special conditions needed for cooling. The end result is a perfectly coated part with deep, even color over every inch and ready to be passed along to final assembly or packaging.