Since its first appearance in the industrial application back in the 1950s, the powder coating pain application process has become a preferred method for painting metal products and parts. There are multiple advantages to using powder coating as opposed to wet spray-painting. Powder coating enjoys superior dry film thickness to liquid paint, being applied in thicknesses of 2-6 mils (a mil is a thousandth of an inch) whereas the best thickness that can be achieved with wet paint is maybe one mil. Indeed, if the painting job is for pure functionality, a ten mil thickness can easily be laid down. This results in a second advantage: superior hardness and durability, which improves the coating’s resistance to chipping and scratch damage.
As a result of the pretreatment process, powder coatings adhere better to the substrate than wet paint. This is due to not only the cleaning the substrate is subjected to, but also its electrical grounding prior to application. As the powder is fired from the application gun, it also has an electromagnetic charge imparted to it which draws the powder directly to the metal surface. Because of this quality and the performance of the powder under the curing process, powder coats also possess superior flexibility to dried liquid paints. The substrate can be bent repeatedly and the powder coat will not crack or flake off. Tests conducted on powder coated substrates have demonstrated that the finished coating can withstand elongation of up to 800% of its original coverage area before it fails.
More importantly, powder coat finishes have far superior corrosion resistance to standard paints. In manufacturer tests, these finishes have withstood 1000 hours of exposure to salt spray without damage. Purely functional coatings have even longer endurance. While it is possible to scratch a powder coat finish, it’s other material qualities as discussed above will confine the degree of corrosion upon the substrate to the actual area of the scratch, leaving the rest of the coating relatively undamaged.
Finally, because powder coating involved the use of dry substance as opposed to liquid chemical paints, it is a far more environmentally-friendly process. It is neither a serious health hazard, nor flammable, nor an environmental pollutant. The leftover dust is easily evacuated from the application booth and can be recovered for later reuse.
For more information, look here. Find out how a powder coating production line can be added to your factory space. Contact us today.