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Question
Give a scientific explanation.
The particles of powder are given an electric charge while spraying them to form the powder coating.
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Solution
- 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 other ingredients are melted, 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 in the powder are given an electrostatic charge, causing a uniform layer of the powder to adhere 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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