Finishing Services – Anodizing

Anodic oxidation, the electrochemical oxidation of a metal or alloy. The process by which aluminum and its alloys form an oxide film on the aluminum product (anode) under the action of impressed current in the corresponding electrolyte and specific process conditions. Anodic oxidation, if not specified, usually refers to anodic oxidation of sulfuric acid.


In order to overcome the surface hardness, wear resistance and other defects of aluminum alloy, expand the application range, extend the service life, surface treatment technology has become an indispensable part of the use of aluminum alloy, and anodic oxidation technology is the most widely used and the most successful.

Anodic oxidation of aluminum is an electrolytic oxidation process in which the surface of aluminum and aluminum alloys is usually converted into an oxide film that has protective, decorative, and other functional properties. Anodic oxidation of aluminum from this definition includes only the part of the process that produces an anodic oxidation film.


An oxide film is formed on the surface of a metal or alloy as an anode by electrolysis. Metal oxide film changes the surface state and properties, such as surface coloring, improve corrosion resistance, enhance wear resistance and hardness, protect the metal surface. For example, anodic oxidation of aluminum, aluminum and its alloys in the corresponding electrolyte (such as sulfuric acid, chromic acid, oxalic acid, etc.) as the anode, under specific conditions and impressed current action, electrolysis. Anodic oxidation of aluminum or its alloys to form a thin layer of aluminum oxide with a thickness of 5 to 30 microns and a hard anodic oxidation film of up to 25 to 150 microns. Anodized aluminum or its alloy, improved its hardness and wear resistance, up to 250 ~ 500 kg/m2, good heat resistance, hard anodized film melting point up to 2320K, excellent insulation, breakdown resistance voltage up to 2000V, enhanced anti-corrosion performance, in the =0.03NaCl salt fog for thousands of hours without corrosion. Oxidation film thin layer with a large number of micropores, can absorb a variety of lubricants, suitable for the manufacture of engine cylinders or other wear-resistant parts; Membrane microporous adsorption ability can be colored into a variety of beautiful and gorgeous colors. Non-ferrous metals or their alloys (such as aluminum, magnesium and their alloys, etc.) can be anodized. This method is widely used in mechanical parts, aircraft and automobile parts, precision instruments and radio equipment, household goods and architectural decoration.

 

Generally speaking, the anode is aluminum or aluminum alloy as the anode, the cathode is selected lead plate, aluminum and lead plate together in an aqueous solution, there are sulfuric acid, oxalic acid, chromic acid, electrolysis, so that the surface of aluminum and lead plate form an oxidation film. The most extensive of these acids is the anodic oxidation of sulfuric acid.

 

The oxidation of a material other than a metal as an anode, also called anodic oxidation.


In the practical process, for the anodic oxidation of aluminum alloy, more, can be applied in daily life, because of the characteristics of this process, aluminum surface produces a hard protective layer, can be used in the production of kitchen utensils and other daily necessities. But the anodized cast aluminum is not good, the surface is not bright, can only be black. Aluminum profiles are better.


As a OEM supplier, Nice Rapid is experienced in anodic oxidation with a customer satisfaction rate of 98%.We provide 3D printing technology, as well as cnc machining, Vacuum Casting. Usually we will make the products according to the 3D models that provided by our customer. We are able to make both plastic and metal products, such as aluminum, steel, brass etc… And most of plastics are available, such as ABS, PP, PC, PMMA…

Besides, we provide some surface finish, like anodization, plating, sandblasted, painting, silk screen and so on. 

 

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Author: Chris Na