Anodizing profiles

What is aluminum anodizing?

Many metals tend to oxidize and a relatively stable layer of oxide forms on them. This oxide layer is protective under certain conditions and prevents corrosion of the metal surface. In practice, by using this property, they strengthen or create an oxide or hydroxide layer on metals. This type of surface treatment is called conversion or oxide coating.

This oxide layer is created on metals in two ways:

Chemical method: due to the absorption of metal or metal oxide on the surface that creates a stable layer. Such as: chromatization.

Anodic or electrochemical method: In this method, the metal oxide is formed under controlled conditions and is completely condensed, or it will be dense and impenetrable due to subsequent operations. Such as: aluminum anodization.

Aluminum is also oxidized under normal conditions, so that in the vicinity of air, a layer of non-porous oxide is usually formed on the surfaces of aluminum parts, which is responsible for protecting the surface of the metal in the environment, but the advantage of the oxide is created. In the anodizing method, it is more resistant to corrosion than under natural conditions. In this method, the high resistance of Al2O3 aluminum oxide coating layer against corrosion is used, which is immediately created on the freshly cut aluminum surface. This layer is the natural factor of corrosion resistance of this metal. This naturally formed layer is very thin, sticky and protective. Anodizing is actually a kind of thickening of the oxide layer several thousand times the thickness of a normal oxide layer. The result is a hard layer with a thickness of about 25.5 microns on the entire surface of aluminum, which, in addition to corrosion resistance, also has sufficient strength against wear.

In general, anodizing is done to increase the physical and chemical resistance of aluminum sheets.

The steps of anodizing aluminum profiles

Anodizing is an electrochemical process to thicken oxide layers on active metals such as aluminum. Anodizing operation on aluminum profiles includes different stages of surface preparation.

These steps are summarized as follows:

1- Degreasing and cleaning with solvent or alkali

2. Exfoliation or etching with soda solution, which leads to opacity of the surface.

In general, anodizing is done to increase the physical and chemical resistance of aluminum sheets.

The steps of anodizing aluminum profiles

Anodizing is an electrochemical process to thicken oxide layers on active metals such as aluminum. Anodizing operation on aluminum profiles includes different stages of surface preparation.

These steps are summarized as follows:

1- Degreasing and cleaning with solvent or alkali

2. Exfoliation or etching with soda solution, which leads to opacity of the surface.

3- Anodizing: Creating an oxide coating with an electric current on the aluminum surface in a sulfuric acid bath.

4- Electrocalring: coloring the porous surface with mineral metal salt using electric current

5- Sealing: In this step, the holes of the porous film are hydrated (hydrated aluminum oxide / boehmite H2O) and filled.

The anodizing process is performed on aluminum profiles for the following reasons:

1. a) Increase the profile’s resistance to corrosion
2. b) increasing the adhesive strength of colors
3. c) as one of the electroplating steps
4. d) Create a suitable appearance
5. e) Insulation
6. g) Increased wear resistance

During the process of anodizing aluminum profiles, the profile can be turned into beautiful colors and add beauty and strength, and as a result, profiles with beautiful and attractive colors are produced, the surface of which can be easily washed with hot water. There is no need for it. It does not require any cleaning and maintenance and is naturally resistant to corrosion.