Aluminum anodizing

Аnodizing of aluminum profiles is a process to harden surfaces and increase the wear and corrosion resistance of this corrosion-prone metal. It works by electrolytic passivation and depositing an oxide layer on the surface of the metal. This oxide layer occurs naturally on aluminum alloys, and therefore the anodizing process is most commonly used on aluminum and aluminum alloy surfaces. Manufacturers use anodizing aluminum profiles to increase the structural stability and strength of elements such as roofs, exterior surface panels, and window frames. Aluminum anodizing is also done for the purpose of protection and additional strength, for exposed aluminum parts.

Electrolytic passivation process

Passivation is the formation of thin oxide or salt films on the metal surface, which protects it from external corrosion. Such a coating prevents the contact of the metal with oxygen and aggressive media. During the electrolytic passivation process, protective films can form on a metal surface both naturally and artificially. In the first case, they consist of oxides of chemical elements that make up the metal itself, and in the second case, they may include oxides and salts of other chemical elements.

For example, pure aluminum naturally forms a very resistant oxide film and is therefore resistant to most types of corrosion. But products made from its alloys containing chemically active components already need artificial corrosion protection and therefore are subjected to passivation in saline solutions. Passivation is widely used to protect the surfaces of steel, copper, nickel, aluminum, and their alloys. Such films can reduce the contact conductivity of the base material, but, as a rule, to a lesser extent than a layer of corroded metal.

Color anodizing of aluminum profiles

The procedure of color electrolytic anodization consists in immersing the product in an acid solution with one or several metal salts. As a result, metals are deposited in aluminum pores. The composition of the electrolyte determines the color of the finished product. Color anodizing of aluminum profiles does not depend on the thickness of the anode layer, but on the amount of metal settled in the pores. By its properties, this color anodizing is identical to the usual anodic coating. This method is used for facade panels and aluminum profiles. The adsorption dyeing method is used with various dyes. Aluminum with the anodized coating is immersed in an aqueous or alcohol solution of the dye. The intensity of coloring depends on the amount of paint. After absorption of the dye, sealing is performed.

Color integral coloring is carried out in the process of anodizing. Depending on the thickness of the oxide layer, the product can acquire a shade from light bronze to deep black. This is an expensive method because complex acids are used for anodizing. It's not surprising, that electrolytic coloring noticeably narrowed this type of processing of products used in construction. A variety of electrolytic coloring is interference color anodizing. Using the method of optical interference, you can get a wide range of color solutions. To increase the intensity of the color, after the aluminum anodization and before the electrolytic painting, the coating is treated to expand the pores. Before the final use, the profiles can go through the final stage - аluminum profile powder coating, after which the factory supplies the products for mass consumption. You can familiarize yourself with our products in the corresponding section of our website.

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