Six Powder Coating Methods for Aluminum Profiles

Due to the continuous advancement of powder coating technology, 

industrial aluminum profiles with static powder coating have become a popular choice in the industry.

This is because of their unique advantages, 

particularly their high recycling rate of up to 95% and the absence of pollution to the environment.

Powder coatings can be applied at room temperature without requiring preheating,

and they produce a thick film in one application without sagging. 

There are several powder coating methods available, including air spraying, fluidized bed dipping, 

electrostatic fluidized bed dipping, electrostatic powder spraying, flame spraying, electrostatic air spraying, and more.

Each powder coating method has distinct characteristics and applicable conditions. 

Below is a brief analysis of these coating methods and their features.

Air spraying of industrial aluminum profiles

The powder coating is placed in a spray gun, 

and the powder is adsorbed on the preheated industrial aluminum profile surface using the adsorption force of compressed air.

The powder is melted on the surface of the industrial aluminum profile and can use thermoplastic or thermosetting powder.

If it is a thermosetting powder, it should be cured in an oven. 

This spraying method is suitable for the surface of small industrial aluminum profiles.

Mechanical spraying of industrial aluminum profiles

This spraying method mixes powders of different sizes with glass beads in a certain proportion, 

sprays them out of the nozzle, and deposits the powder on the surface of industrial aluminum profiles under the impact of glass beads.

This method is suitable for spraying thinner films (2-10μm) on industrial aluminum profiles.

Electrostatic fluidized bed dipping of industrial aluminum profiles

This spraying method combines the fluidized bed dipping method with electrostatic powder spraying,

using thermoplastic or thermosetting powder, and is suitable for batch production of small industrial aluminum profiles below 150μm.

Electrostatic flocking coating of industrial aluminum profiles

Place thermoplastic or thermosetting powder between two parallel electrodes, make the powder coating charged, 

and adsorb the coating on its surface through the electrode. 

The fluidized bed should be placed at the bottom of this device, and the nozzle sprays out the powder.

This spraying method is suitable for small industrial aluminum profiles with a thinner film (about 10-20μm).

Fluidized bed dipping of industrial aluminum profiles

The industrial aluminum profile is first preheated and then dipped in the powder coating fluidized bed 

to melt the powder on the surface of the industrial aluminum profile. 

It can use thermoplastic or thermosetting powder. If it is a thermosetting powder, it should also be cured in an oven.

This spraying method is suitable for the surface of small industrial aluminum profiles with thin film thickness, 

as well as medium-sized pipes or metal mesh that can be soaked all-around.

Electrostatic powder spraying of industrial aluminum profiles

This is one of the most widely used powder spraying methods at present, 

which utilizes the principle of electrostatic adsorption to make the electrostatically 

induced powder coating carry opposite charges and adsorb on the surface of the industrial aluminum profile. 

It can be hot sprayed or cold sprayed and should be dried in an oven after spraying. 

This spraying method is suitable for industrial aluminum profiles of different sizes and shapes, 

and can use thermoplastic or thermosetting powder.