Surface Finishes
Aluminum Anodizing Services
We offer anodizing type Ⅱ and type Ⅲ, which are ideal surface finishes for aluminum parts. Anodizing protects aluminum parts from wear and corrosion.
ECOREPRAP Aluminum Anodizing Service
At ECOREPRAP, we provide aluminum anodizing as a controlled electrochemical process to enhance surface hardness, corrosion resistance, and appearance of aluminum parts. The process converts the outer surface of aluminum into a durable aluminum oxide layer, which is integral to the base material rather than a separate coating.
We support both Type II (standard anodizing) and Type III (hard anodizing) processes to meet different application requirements. Type II anodizing is commonly used for general-purpose protection and aesthetic finishes, offering good corrosion resistance and a wide range of color options. Type III anodizing produces a thicker and harder oxide layer, providing superior wear resistance and durability for high-stress or abrasive environments.
For Type II anodizing, we offer multiple color options including clear, black, and custom dyed finishes. The porous structure of the anodized layer allows dyes to penetrate evenly, enabling consistent and repeatable coloration across production batches.
Anodizing maintains relatively tight dimensional control, although part of the oxide layer grows into the material and part builds outward. Thickness can be adjusted based on functional needs, and is considered during the design and machining stages.
Our process includes surface preparation, anodizing, optional dyeing, sealing, and inspection to ensure consistent coating quality. Sealing is critical to improve corrosion resistance and color stability by closing the pores of the anodized layer.
With our CNC machining experience, we take into account alloy selection, surface finish, and part geometry to ensure the anodizing process aligns with both functional and aesthetic requirements.
| Anodize Type | Applicable Materials | Surface Preparation | Color | Glossiness | Cosmetic Availability | Thickness | Visual Appearance |
| Type Il Anodize | Aluminum | As machined (Ra 1.6μm) | Clear, Black, Red, Blue, Purple, Gold | Matte | No | 50μm to 150μm | Parts are anodized directly after machining. Machining marks will be visible. |
| Bead blasted (Grit #120 #150 #200) | Clear, Black, Red, Blue, Purple, Gold | Matte | On Request | 8μm to 16μm | Grainy texture, matte finish | ||
| Type Ⅲ Anodize | As machined (Ra 1.6μm) | Clear,Black | Matte | No | 35μm to 50μm | Parts are anodized directly after machining. Machining marks will be visible. | |
| Bead blasted (Grit #120 #150 #200) | Clear,Black | Matte | On Request | 35μm to 50μm | Can be slightly visible if parts are “Not Cosmetic” Completely removed if parts are “Cosmetic” |
Aluminum Anodizing Type II Color Options
Clear/Natural
Black
Gold
Green
Purple
Red
Blue
Custom
Aluminum Anodizing Type Ⅲ Color Options
Natural
Black
- *Anodizing is often used with the beadblasting to give the surface a uniform appearance.
- *Glossy anodizing is available on request.
- * If you need a particular Pantone color code, please contact info@ecoreprap.com.
Aluminum Anodizing Parts
Anodizing Type II Red
Anodize Type II Red Detail
Anodizing Type Ⅲ Natural
Anodizing Type Ⅲ Natural Detail
Anodizing Process
Anodizing is an electrolytic passivation treatment that grows the all-natural oxide layer on aluminum parts for security from wear and rust, along with aesthetic outcomes. Let us break down the basic steps for anodizing a part:
1. Connect the part to an anode
2. Submerge the part in acidic electrolyte solution
3. Apply a cathode to a metal electrode in the solution
4. Positive ions react with negative O2 ions and the surface becomes porous
5. This grows a layer of aluminum oxide on the part
6. Use corrosion inhibitors or colored dyes for cosmetic purposes
7. Seal the nanopores
Aluminum Anodizing Design Considerations
- Anodizing uses jigs or racks to hold parts, which can leave marks in untreated areas. If you need specific areas mark-free, provide a drawing and follow our cosmetic procedure.
- Anodizing insulates your parts, reducing their conductivity.
- Anodizing doesn't require masking by default because it doesn't significantly increase part thickness. If you need specific areas masked or plugged, please specify that in your CAD file.
- Type III anodizing significantly thickens your part's surface. To maintain critical surfaces, we advise plugging or masking threaded/reamed holes and other vital areas.
FAQs
Anodizing is an electrochemical process that forms a protective oxide layer on the surface of metal, typically aluminum, to enhance corrosion resistance and improve surface durability.
No, anodizing is primarily used for aluminum and its alloys. It is not suitable for most other metals like steel or copper.
The two primary types are sulfuric acid anodizing (Type II) and hard anodizing (Type III), with Type II providing a thinner and decorative finish and Type III producing a thicker, more wear-resistant coating.
Anodizing provides corrosion resistance, enhances aesthetics, and can be used to prepare the surface for coloring, making it a common choice for aluminum products.
Yes, anodized aluminum parts can be dyed to achieve various colors. The porous nature of the anodic layer allows for dye absorption.
The two primary types are sulfuric acid anodizing (Type II) and hard anodizing (Type III), with Type II providing a thinner and decorative finish and Type III producing a thicker, more wear-resistant coating.
Yes, anodizing can reduce the electrical conductivity of aluminum. The anodizing process creates an insulating oxide layer on the surface of the aluminum, which can hinder its electrical conductivity. The extent of the reduction in conductivity depends on the thickness of the anodic layer and the specific type of anodizing process used.
Yes, anodizing is suitable for both intricate and precision parts, as it offers good dimensional control. For highly precise dimensions, especially with Type III anodizing, it’s important to note that it may cause size changes.