Whenever one needs to perform powder coating Los Angeles should not be left out in the list of places to check out. Powder coating is the process of applying dry powder on surfaces in its free flowing state. Dry powder coat is similar to the normal liquid paint with the exception that the former does not require a liquid solvent to be useful.
Powdered paint may be used to paint several kinds of equipment ranging from automobile parts to household appliances. More research shows that other substrates such as medium density fiberboards may also be coated using various processes. Apart from metals, plastics and ceramics can also be painted using this procedure. The application process involves three major phases with the actual application being performed using electronic guns.
The three steps entailed in the application process are surface preparation, actual application, and lastly curing. Surface preparation is important before application because it removes oil, grease, dirt, dust, metal oxides, mold, and welding scales among other unwanted materials. Preparation can be done through various chemical and mechanical techniques. The method used should be dictated by material and size of the object, type of dirt to be eliminated, and use of the end product.
Chemical treatment involves use of phosphates and/or chromates in submersion and/or spray application. This is carried out in multiple phases and involves etching, various rinses, de-smutting, degreasing, and chromating and/or phosphating of the work pieces as the final stage. Pre-treatment is crucial since it cleans and boosts the bonding capability of coats to substrates. Utilization of chromate compounds is reducing as they pose a threat to the environment.
The major and most popular way of applying powdered coating onto substrates is to use a corona or electrostatic gun. The gun positively charges the particles of the paint as the paint is released at the nozzle. The positively charged particles are then propelled to the substrate by mechanical means or compressed air. Electrostatic charges function to accelerate the particles further. There are different models of nozzles that can be used to achieve specific application requirements.
Another method of applying powdered paint is referred to as fluidized bed technique. This method entails warming the substrate to high temperatures and then introducing it in an aerated bed packed with the coat. As the coat comes in contact with the heated substrate, it melts down and adheres onto it. Additional heating is necessary to finish the curing. Fluidized bed technique is necessary if thickness of the coat is expected to be over 300 micrometers.
The powdered film can be removed using various chemical compounds like methylene chloride. Other organic solvents are observed to be very inefficient in removing the coat. Methylene chloride is however being replaced by benzyl alcohol because it is suspected to have carcinogenic characteristics. Abrasive blasting can also be used to eliminate the coat. The substrate can still be re-powdered after being cleaned.
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