Anodizing
Time: 2018-04-16 Reads: 2887 Edit: Admin
Anodizing

Basic introduction
Anodic oxidation is the electrochemical oxidation of metals or alloys.A metal or alloy plate is used as an anode and an electrolytic method is used to form oxide films on the surface.
The metal oxide film changes the surface state and properties, such as surface shading, enhancing corrosion resistance and abrasion resistance and hardness, protecting the metal surface and so on.
Take aluminum nodizing as example,the aluminum and its alloys are placed in the corresponding electrolyte (e.g., chromic acid oxalic acid, etc.) as the anode and electrolysis under certain conditions and external currents.Anodic aluminum or its alloy oxidation, on the surface formed alumina thin layer, its thickness is 5~20 microns, hard anodic oxide film can reach 60~200 microns.After anodic oxidation of aluminum or its alloy and improve its hardness and wear resistance, can reach 250 ~ 500 kg per square millimeter, good heat resistance, hard anodic oxidation film melting point as high as 2320 k, excellent insulation, resistance to breakdown voltage of 2000 v, to enhance the corrosion resistance, hitches in omega = 0.03 NaCl salt fog corrosion thousands of hours.The thin layer of oxide film has a large number of micropores, which can absorb various lubricants, suitable for making engine cylinder or other wear-resisting parts.The film microporous adsorption capacity can be tinted into various beautiful and colorful colors.

The advantage of anodizing
1.Anti-static
2.Micron on the surface
3.Wear resisting

Semiconductor devices, a lot of small aluminum anodized, it‘s may be for increasing the hardness, reduce wear and tear, but the most commonly used surface treatment technology is electroless plating nickel, aluminum nickel plating is very beautiful like stainless steel.

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