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Aluminum anodizing Aluminum surface treatment silver dark red blue gold

Anodic oxidation is the electrochemical oxidation of metals or alloys. Aluminum and its alloys form a layer of oxide film on aluminum products (anode) under the action of external current under corresponding electrolyte and specific process conditions. Anodizing, if not specified, usually refers to sulfuric acid anodizing.
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  • 6063 6061 7075

  • yurun

Equipment resources of Yurun aluminum products: 13 international advanced aluminum profile extruders, with an annual production capacity of more than 20000 tons; More complete aluminum profile precision processing equipment; More complete aluminum profile oxidation pretreatment equipment, including polishing, wire drawing, sand blasting and other equipment. Environmentally friendly anodizing production line. The total plant area is about 30000 square meters. It is a manufacturer integrating "aluminum profile extrusion, precision machining and surface treatment".

The company is located in the Yangtze River Delta with superior geographical location, leading science and technology and developed transportation in China.

Yurun aluminum products has served thousands of enterprises and is a long-term partner of many state-owned enterprises, multinational corporations and the world's top 500 companies.

Our fields include: automobile industry, aerospace, industrial automation, medical devices, home decoration, home appliance electronics and other industries.

Our advantages: we have focused on industrial aluminum profile processing for 16 years, providing customers with one-stop supporting services such as aluminum profile extrusion, processing and surface treatment, so as to save customers' worry, rest assured and inspire them to become the leading comprehensive aluminum product R & D manufacturer in the industry.

The so-called anodic oxidation of aluminum is an electrolytic oxidation process. In this process, the surface of aluminum and aluminum alloy is usually transformed into a layer of oxide film, which has protective, decorative and some other functional characteristics. From this definition, the anodizing of aluminum only includes the process of forming anodic oxide film.

An oxide film is formed on the surface of metal or alloy parts by electrolysis. Metal oxide film changes the surface state and properties, such as surface coloring, improving corrosion resistance, enhancing wear resistance and hardness, protecting metal surface and so on. For example, aluminum anodizing, aluminum and its alloy are placed in the corresponding electrolyte (such as sulfuric acid, chromic acid, oxalic acid, etc.) as the anode for electrolysis under specific conditions and applied current. Anodized aluminum or its alloy forms a thin layer of alumina on the surface, with a thickness of 5 ~ 30 microns, and the hard anodized film can reach 25 ~ 150 microns. The anodized aluminum or its alloy improves its hardness and wear resistance, up to 250 ~ 500 kg / mm2, good heat resistance, the melting point of hard anodized film is up to 2320k, excellent insulation, breakdown voltage resistance is up to 2000V, and enhances the corrosion resistance ω= 0.03 NaCl salt spray does not corrode after thousands of hours. The thin oxide film has a large number of micropores, which can adsorb various lubricants and is suitable for manufacturing engine cylinders or other wear-resistant parts; The membrane has strong microporous adsorption capacity and can be colored into various beautiful and gorgeous colors. Non ferrous metals or their alloys (such as aluminum, magnesium and their alloys) can be anodized. This method is widely used in mechanical parts, aircraft and automobile parts, precision instruments and radio equipment, daily necessities and architectural decoration. [1]

Generally speaking, the anode uses aluminum or aluminum alloy as the anode, and the cathode selects the lead plate. The aluminum and lead plate are put together in the aqueous solution, which contains sulfuric acid, oxalic acid, chromic acid, etc. for electrolysis to form an oxide film on the surface of the aluminum and lead plate. Among these acids, the most widely used is anodic oxidation with sulfuric acid.


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