English
Arabic
Dutch
French
German
Italian
Japanese
Korean
Portuguese
Russian
SpanishAnodizing
Anodizing: An Introduction
Anodizing is a surface treatment process that uses electrochemistry to form a layer of Al2O3 (aluminum oxide) on aluminum and aluminum alloy surfaces. A metal’s surface state and performance can be changed by anodic oxidation, which improves corrosion resistance, increases wear resistance, and protects the metal’s surface.
This method is widely used in mechanical parts, aircraft and automobile parts, precision instruments and radio equipment, daily necessities and architectural decoration for non-ferrous metals or their alloys.
Anodizing Information
| Features | Type II Anodizing | Type III Anodizing |
| Materials | Aluminum | Aluminum |
| Color | Clear, black, blue, gold, grey, red, etc. | Clear, black |
| Texture | Matte finish with a smooth texture. | Matte finish with a smooth texture. |
| Thickness | The range is 1.8 mm to 25 mm (0.00007″). | The value is greater than 0.001″ |
| Applications | Components for aircraft, architectural parts, kitchenware, consumer goods | Temperature-sensitive, chemically exposed, or worn parts |
Anodizing of Design
- Because anodizing is insulating, anodized parts have poor electrical conductivity.
- In order to prevent local overheating and burning of the workpiece due to current concentration, all edges and corners should be rounded with a radius of no less than 0.5 mm.
- After hard anodic oxidation, rough surfaces can become smoother. However, extremely smooth surfaces will lose some smoothness.
- Hard anodizing requires high voltages and currents, so special fixtures are used to keep the workpiece in good conductive contact. Otherwise, the workpiece will burn or break down.