🟧 Introduction

Before anodizing begins, aluminum undergoes several critical preparation steps that define the strength, uniformity, and appearance of the final oxide layer.
This stage, known as Surface Preparation, is the true foundation of high-quality anodizing.

🔹 Why Surface Preparation Matters

Any contamination — oils, oxides, machining residue — prevents the anodic layer from forming evenly.
 This leads to:

• Color variation
• Weak oxide layer
• Visible patches or streaks
• Reduced corrosion resistance

A perfectly clean surface is essential for a flawless anodized finish.

🔹 Key Stages of Surface Preparation

1. Degreasing

Removes machining oils, fingerprints, and residues.
 Ensures the surface is clean and ready for controlled chemical reactions.

2. Alkaline or Acid Etching

Removes the natural oxide layer and minor surface defects.
 Creates a uniform matte surface ideal for anodizing.

3. Desmutting

Eliminates leftover alloying elements such as silicon or iron.
 Critical for achieving color consistency, especially with alloy series like 6063.

4. Pre-Anodizing Conditioning

May include:

• Chemical polishing
• Mechanical brushing
• Thermal smoothing

This step prepares the surface for a stronger, more uniform anodic layer.

🔹 How Preparation Enhances Final Quality

Proper preparation results in:
 ✔ Stronger anodic layers
 ✔ Superior scratch resistance
 ✔ Stable and consistent coloring
 ✔ Higher corrosion resistance
 ✔ Fewer defects and better repeatability

🔹 Application at Golden East

Golden East uses:

• Digitally monitored preparation tanks
• High-purity chemicals
• Automated cleaning cycles
• Quality checks before anodizing

Ensuring every batch receives a world-class finish.

🟩 Conclusion

Surface preparation is not a preliminary step — it is the foundation of anodizing quality.
With controlled cleaning, desmutting, and conditioning, aluminum achieves the durability and elegance expected in modern architectural and industrial applications.