1.

Give a scientific explanation:The particles of powder are given an electric charge while spraying them to form the powder coating.

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 pigment 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 (ESD).
  • 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 chains.


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