Question

advantages and disadvantages of metal spraying

Answer 1

Benefits of thermal spraying compared to other coating processes are many, and include: ... The coatings can also be applied to thermally sensitive substrates such as low melting point metals and plastics or composites. Thick coatings, typically up to 10mm, can be applied and often at high deposition rates.
The main disadvantage of flame spraying is the level of coating quality. Powder flame sprayed coatings tend to have high porosity (10-20 vol%), low density and high oxide levels (10-20 wt%) for metal deposits, and lower bond strength than coatings prepared by other thermal spraying processes.

Answer 2

Metal Spraying is the process of covering a surface with metal by converting it into a molten state and spraying it onto the surface.

Some advantages of metal spraying are:

• Increases durability: When the metallic particles hit the surface, they spread evenly and harden the surface forming a robust, durable, and water-resistant layer.

• Corrosion protection: The metal on the surface creates a barrier that prevents moisture intrusion and oxidation can't occur without the electrolyte. Thus, preventing the surface from rusting.

• Modify electrical properties: Metals are good conductors of electricity. So, applying them on the surface increases the conductivity.

• Increase wear resistance: Wear resistance of any material is correlated to the hardness of the material. Metal spraying increases the hardness of the surface. Thus, increasing the wear resistance.

Some disadvantages of metal spraying are:

• Dust producing: A large amount of fume and dust is produced, requiring the operator to wear suitable breathing apparatus and protective clothing.

• Manpower Expensive: Some of the methods of thermal spray coatings require very expensive apparatus, which can result in a high initial setup cost.

• Disguises the substrate: As thermal spray coating is so efficient in many cases, it is important to tell what material the substrate was made of after the coating process.

• Cannot precisely evaluate effectiveness: Once the thermal spray coating has been applied, it is often difficult to tell exactly how well the coating has gone on, other than by visual assessment.