Aluminum profile - Anodized Electrophoresis

Product Introduction

1. Product: 

2. Brand: V global

3. Aimed: A common basic material in the fields of architecture, industry, and daily - use items, which can be used to build structural frameworks or serve as components.

Electrophoresis for aluminum profiles is a surface treatment process that combines anodizing and electrophoretic coating to enhance corrosion resistance, durability, and aesthetic appeal. Here’s a step-by-step overview of the process:

1. Pretreatment (Cleaning & Surface Preparation)

Before electrophoresis, the aluminum profile must be thoroughly cleaned to remove oils, dirt, and oxides.

• Degreasing – Alkaline or acidic cleaning to remove oils and contaminants.

• Etching – Mild acid (e.g., sulfuric or phosphoric acid) treatment to remove surface oxides.

• Desmutting – Removal of smut (dark residues) using nitric acid or other solutions.

• Rinsing – Multiple water rinses to ensure a clean surface.

2. Anodizing (Forming a Porous Oxide Layer)

The aluminum undergoes anodization to create a porous aluminum oxide layer:

• Electrolyte Bath – Typically sulfuric acid (15-20%) at 15-22°C.

• Voltage/Current – DC voltage (12-20V) applied, forming a porous oxide layer (5-25µm thick).

• Rinsing – Removes residual acid.

3. Electrophoretic Coating (Electrodeposition of Paint)

The anodized profile is immersed in an electrophoretic paint bath (usually water-based epoxy or acrylic):

• Bath Composition – Contains resin, pigments, and additives (pH 8-9).

• Voltage Application – DC voltage (50-200V) applied, causing paint particles to deposit on the aluminum.

• Film Formation – A uniform, dense coating (5-30µm) forms on the surface.

4. Post-Treatment (Curing & Sealing)

• Rinsing – Removes excess paint.

• Baking (Curing) – Heated to 160-200°C to polymerize and harden the coating.

• Sealing (Optional) – Further enhances corrosion resistance by sealing pores.

5. Quality Inspection

• Thickness Check (coating & anodized layer)

• Adhesion Test (tape or cross-cut test)

• Corrosion Resistance (salt spray test)

• Color & Gloss Consistency

Advantages of Electrophoresis for Aluminum Profiles

✔ Excellent corrosion resistance (better than powder coating)
✔ Uniform coating even on complex shapes
✔ Good UV resistance & color retention
✔ Eco-friendly (water-based, low VOC emissions)

Applications

• Architectural aluminum (windows, doors, curtain walls)

• Automotive trim & parts

• Consumer electronics (frames, housings)