How anodizing aluminum

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2018-03-18 14:46:03

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Mass production of aluminum structures and parts related to the unique properties of this material. It has the lowest specific weight, resistant to many aggressive environments and easily processed. But for the long operation of products be anodized aluminum.

Why you need it

During the interaction of any metal with oxygen contained in the atmosphere, the surface oxidation of the top layer. This is called the formation of the oxide film, which prevents the spread of rust deep into the metal.

anodizing aluminium

Depending on the type of material the oxidation process of the surface is different. Iron and steel practically does not form an oxide film, but precious metals (gold, silver, platinum) are protected from the effects of corrosion. Aluminium takes a middle position, therefore, requires the artificial creation of the film. This is especially important if the production of Windows will apply a similar profile. Anodized aluminum is resistant to external weather factors that may lead to corrosion and rapid loss of performance properties of the design.

Technology

In order for the surface profile formed an effective protective film is required to anodize aluminum. The essence of the process lies in the transfer of molecules of another material that is more resistant to oxygen in the structure of the product. In addition, the possible artificial increase of the oxide layer without the addition of other metals.

profile anodized aluminum

Regardless of the method you must adhere to the conditions of realization of technological process. It consists of the following steps:

  1. Prep.
  2. Anodizing Process.
  3. Fastening layer.

For each selected appropriate equipment and supplies. In the end it should be high-quality anodized aluminum. This will give the opportunity to use the profile for facade and window construction.

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The Preparatory phase

The Surface is thoroughly cleaned from dust, dirt and debris. If there are irregularities or mechanical damage, then eliminate them before the anodizing. Next is to remove the old oxide layer, otherwise it will hamper the uniform formation of the protective film.

anodized aluminum is

After mechanical processing (grinding and degreasing), the profile must be placed in the alkaline solution. To properly anodize aluminum, you must first perform a “etch” of its surface. The formation of microsavers and roughness increases the total area of the protective layer. Further in an acidic solution is performed lightening products. Upon completion of all stages of the aluminium should be thoroughly rinsed.

Anodizing

After completing the preparatory stage, you can begin the process of anodizing. This aluminum product is immersed in a special bath. The procedure is performed with the help of crane equipment (for large structures) or manually on the ropes.

what is anodized aluminium

On the construction of baths is necessary to tell separately. It is a large container of thick-walled stainless steel in which to place the cathode 2. Technology dive profile must be such that the electrolyte present in the bath, in contact with the entire area of the product. As this liquid is sulphuric acid, which places special demands on production safety. If the product has a complex configuration, it is best to apply oxalic acid.

After a dive profile by electrolysis begins to form a protective layer. Its thickness depends on the electrolyte composition, temperature and current density. The higher the last number the greater the oxide film formed on the surface. After completion of the procedure, the layer thickness can vary from 2 to 7 microns, depending on process parameters.

Consolidation

However, to stop anodizing the aluminum is still too early – it is necessary to fix the formed surface layer. It will put a porous structure, which without treatment rapidly exfoliates. Moreover, it does not have the required hardness.

Consolidation can be done by placing the product in fresh water, brought to a state of boiling. According to another technology, surface is processed with hot steam. In any case, the rejection of the oxide film and its molecular bonding with the surface of the aluminum.

If the profile is painted, then the consolidation is not necessary. In the technology of powder coating colour film will be protected as a result of thermal processing.

We found out what is anodized aluminum. Such a treatment of metal - warranty against rust formation on the surface of the product. The technology of anodizing is constantly improving, and today it is possible to perform the painting of aluminum products using cathodic reaction.


Article in other languages:

AR: https://tostpost.com/ar/business/14151-how-anodizing-aluminum.html

BE: https://tostpost.com/be/b-znes/25278-yak-prav-l-na-anodise-alyum-n-y.html

DE: https://tostpost.com/de/business/25302-wie-richtig-anodisierung-aluminium.html

ES: https://tostpost.com/es/negocio/25325-c-mo-anodizaci-n-del-aluminio.html

HI: https://tostpost.com/hi/business/14174-anodizing.html

JA: https://tostpost.com/ja/business/14176-how-anodizing-aluminum.html

KK: https://tostpost.com/kk/biznes/25260-alay-anodirovat-alyuminiy.html

PL: https://tostpost.com/pl/biznes/25187-jak-prawid-owo-anodowa-aluminium.html

PT: https://tostpost.com/pt/neg-cios/25205-como-corretamente-anodiza-o-de-alum-nio.html

TR: https://tostpost.com/tr/business/25266-do-ru-eloksal-al-minyum.html

UK: https://tostpost.com/uk/b-znes/25243-yak-pravil-no-anodirovat-alyum-n-y.html

ZH: https://tostpost.com/zh/business/14820-how-anodizing-aluminum.html






Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."

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