The aluminum spray gun is used for the coating in the thermal spray process. Aluminum spray gun coating is excellent for applications requiring protection against atmosphere, heat, and chemical corrosion. This type of coatings provides anodic protection to iron and cadmium. It provides a dense coating over the surface of the component.
Aluminum coating applied over the surface of the substrate with two methods. One is with a flame spray gun process and another is an electric arc spray gun process. In a flame spray gun process, aluminum wire or powder is melted. For melting the aluminum wire or powder flam able gases are used with compressed air.
Compressed air is used to increase the velocity of molten metal to impinge on the surface of the substrate. For melting aluminum wire or powder oxygen gas is used acetylene gas. Some time LPG is used with oxygen at a place of acetylene. In a flame spray gun, the gas flow meter is used to control the flow of oxygen and acetylene or LPG.
In the arc spray gun process for coating aluminum wire or powder is melted with electricity. In this spray, gun aluminum is fed between two electrodes one is an anode and the other is a cathode. An electric arc is generated between an anode and a cathode to melting the aluminum.
Working Of Aluminum Spray Gun
Following the surface preparation, the aluminum spray gun is used to coat the surface. The sand/shot blasting machine is used to prepare the surface of the substrate. The aluminum coating protects the surface from rust and oxidation.
The gas flow meter is used to check the flow of gases in an aluminum spray gun. The flow of oxygen and acetylene in the gas flow meter must be set according to the requirements. More gas flow (oxygen + LPG/ Acetylene + Compressed Air) can cause damage to the spray gun and coating material. And if the flow of gas is greater than the equal coating is difficult to achieve on the substrate's surface.
Main Applications Of Aluminum Spray Gun
Atmospheric Corrosion
The aluminum coating acts as a galvanic corrosion inhibitor and also produce oxide film to protect the coating. Aluminum coating highly recommended under a variety of environmental conditions and used on submerged water applications.
Chemical Corrosion
Aluminum wire coating is useful in the protection of commercial equipment in contact with marine, chemical processing equipment, oil refining equipment, and similar environmental exposures equipment.
High-Temperature Corrosion
Aluminum coatings are applied to increase the service life of automotive engine exhaust systems, to protect against thermal shock, steel heat-treating equipment, and to reline jet engine combustion chambers.