Question

WHY



The particles of powder are given an electric charge while spraying them to form the powder coating.

Answer 1

Powder coating is a type of coating that is applied as a free-flowing, dry powder. The main difference between a conventional liquid paint and a powder coating is that the powder coating does not require a solvent to keep the binder and filler parts in a liquid suspension form. The coating is typically applied electrostatically and is then cured under heat to allow it to flow and form a "skin". The powder may be a thermoplastic or a thermoset polymer. It is usually used to create a hard finish that is tougher than conventional paint. Powder coating is mainly used for coating of metals, such as household appliances, aluminum extrusions, drum hardware, and automobile and bicycle parts. Newer technologies allow other materials, such as MDF (medium-density fibreboard), to be powder coated using different methods. The powder coating process was invented around 1945 by Daniel Gustin US Patent 2538562.

Answer 2

Answer:

powder coating is a method of applying a layer harder than paint on the surface of an iron object to prevent rusting.

in this method , a polymer resin , a pint and some other ingredients are melt mixed , cooled and ground into a uniform powder.

this powder is sprayed on the polished metal surface by electrostatic spray deposition .

in this method , the particles of the powder are given an electrostatic charge due to which a uniform layer of the powder sticks to the metal surface.

then the object is heated in the oven along with the coating.

a chemical reaction occurs in the layer resulting in the formation of long cross - linked polymeric chairs