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Aluminum powder coating

The group of non-ferrous metals includes alloys that do not have iron in their composition. These are: copper, aluminum, zinc, tin, lead, nickel, chromium, silver, etc. Such non-ferrous metals are much better resistant to the formation of corrosion and rust than ferrous metals. But, there is still a risk of adverse effects in terms of time. Therefore, non-ferrous metal products are recommended to coat with powder paint.

We will consider such an important issue as powder coating of aluminum in today’s article.

Preparation of aluminum for painting

First of all, aluminum should be degreased by steam-water-blasting, then heated and washed with special cleaning solutions.

An aluminum product should also be inspected. If there are serious rust damage, a mechanical cleaning should be carried out (for example, sandblasting).

To increase the durability of the product, as well as for better adhesion of the paint to the metal, aluminum is chromated.

If aluminum is in good condition (no obvious rust), then chromating can replace all stages of product preparation.

Chromatization using acidic solutions helps to degrease and brighten aluminum by removing the oxide film. The main rule for chromatizing is thoroughly flushing after each step.

This is done by immersing the aluminum product in pre-treatment baths. They are filled with alkaline or acidic solvents.

It is also possible to supply solutions using a jet under pressure – a jet cleaning method. They help to clean the surface better of dirt, rust, etc.

After degreasing, aluminum proceeds to the next stage – chemical etching. It is necessary to remove the oxide film (plaque formed under the affect of the air on aluminum).

Next, a thin layer of phosphate chromium is applied to the surface (chromatization step).

покраска алюминия порошковой краской

Aluminum Powder Coating

After a quality preparatory work, you can start painting aluminum.

The process of painting aluminum has no difference from painting any other metal.

The process includes:

  • application step;
  • polymerization step;
  • cooling stage.

The paint is applied manually or using automatic powder coating lines in the spraying chamber.

The spraying chamber creates excellent conditions for the painting process. Due to the closed design of the chamber and filter block the paint is not sprayed throughout the workshop, but fall on the product and in the chamber. The paint that has not been laid on can be reused (for example, for a primer coat).

камера напыления порошковой краски фото

Then aluminum is transferred to the polymerization furnace, where, under the influence of high temperatures, the paint begins to polymerize (melt and solidify on the metal).

The metal is heated evenly at a temperature of from 180 to 220 ° C in the polymerization furnace.

печь полимеризации порошковой краски фото

After carrying out such painting processes, you will receive high-quality painting on an aluminum product.

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