At a Glance
Anodizing protects metal by increasing the thickness of its surface oxide layer. It is commonly use in aluminium machining. When a coating less than 0.001” is produced, it is called standard or Type II anodizing. When coatings thicker than 0.001” are produced, it is called hardcoat or Type III anodizing. Anodizing is often used to color parts, improve durability and enhance corrosion resistance. It also provides better adhesion of lubricants to raw metal and reduces galling of threaded components. Anodizing is typically applied to Custom Aluminum Parts, but can also be applied to other metals including magnesium and titanium, and can be dyed to almost any color.
How Anodizing Works
Anodizing works by electrolytic passivation, a process where the part being coated serves as the anode of an electrolytic cell. When this cell is electrically charged with DC current, oxygen is created on the surface of the anode, which then reacts with the part to form an oxide layer. Anodizing is commonly performed in a sulfuric acid solution.
Types of Anodizing
Here at DH Machining, we offer various of high quality anodizing.
| Type of Finishing | Materials | Thickness | Color | Reference Standard |
|---|---|---|---|---|
| Anodizing clear | Aluminum | 9~14 μm | Clear | MIL-A-8625F TYPE 2, CLASS 1 |
| Anodizing black | Aluminum | 8~12 μm | Black | MIL-A-8625F TYPE 2, CLASS 2 |
| Hard anodizing clear + teflon | Aluminum | 25~35 μm | Grey | MIL-A-63576 |
| Hard anodizing black + teflon | Aluminum | 25~35 μm | Black | MIL-A-63576 |
| Hard anodized clear | Aluminum | 25~35 μm | Grey | MIL-A-8625F TYPE 3, CLASS 1 |
| Hard anodized black | Aluminum | 25~35 μm | Black | MIL-A-8625F TYPE3, CLASS 2 |
| Red anodizing | Aluminum | 10~15 μm | Red | MIL-A-8625F TYPE 2, CLASS 2 |
| Chemical polishing anodizing clear | Aluminum | 5~10 μm | Bright white | MIL-A-8625F TYPE 2, CLASS 1 |
| Golden anodizing | Aluminum | 10~15 μm | Golden | MIL-A-8625F TYPE 2, CLASS 2 |
| Blue anodizing | Aluminum | 10~15 μm | Blue | MIL-A-8625F TYPE 2, CLASS 2 |
| Sandblasting + anodizing | Aluminum | 5~10 μm | Silvery clear | MIL-A-8625F TYPE 2, CLASS 1 |
| Special hard anodizing | Aluminum | 40~60 μm | Clear / Black | MIL-A-8625F TYPE 3, CLASS 1 |