Explain metal spraying process and give two applications.

Explain metal spraying process and give two applications.
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Answer :

Metal praying of metalizing literally means to treat with or coat with a metal or metallic compound. Metalizing as a process normally includes the preparation of base material, the spraying on the metal and finally finishing the surface by grinding. Basically there are two types of equipment are used for metal spraying. One is the metallic gun which consists of a gas torch with a hole in centre of the tip for the wire, a small air turbine and gears to feed in the wire through the tip into the flame as fast as it melts and an air cap around the torch tip and nozzle which supplies a blast of air to atomise the molten metal and deposit it on the prepared surface. In other method powered metal is fed from container through rubber hose to spraygun and out through the centre of flame , similar to the wire gun. In this case metal is already in atomized form and hence air needed is sufficient to deposit the molten metal on the surface being coated. The metallic-gun using metal in the wire form is commonly used . The wire is fed to spray gun at a definite rate melted by an oxyacetylene flame, and then blown on the surface being coated, by compressed air. A sectional view of metal spraying gun is shown in fig.

image 

Applications of metal sprayings:

1. Corrosion protection:

2. Sprayed coatings can be applied even to non-metallic surface such as wood, plastic etc.

3. Metal spraying is used for reclaiming the worn out machine parts.

4. Its other applications are in having decorative films, reflecting surfaces and special metal forms. 

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