Custom Sheet Metal Fabrication Aluminum Laser Cut and Bending Stainless Steel Parts for Auto Stamping Process

Is sandblasting + anodizing just a process to make metal surfaces “look better”? The answer is definitely no. These two surface treatments are not only about appearance—they play a practical and important role in product performance.

Sandblasting: Creating the Ideal Surface Condition
Sandblasting is a method that uses high-speed particles to impact the surface of a workpiece. Its functions include:

1. Removing impurities, oxide scale, burrs, and flash, ensuring the cleanliness of the material surface and providing a good foundation for subsequent processing or treatment.
2. Increasing surface roughness, which helps improve the adhesion of subsequent coatings to the workpiece, making the anodized layer more uniform and durable. Note: products after sandblasting will have a uniform, matte finish with a frosted texture. However, the surface finish is generally above Ra 1.6.

3.Eliminating stress concentration points, reducing the risk of fatigue during the part’s use.

Anodizing: More Than Just Aesthetic
Anodizing forms an oxide layer on the metal surface through an electrochemical process. This layer can display various colors, but more importantly:

1. Enhances corrosion resistance, extending the service life of the part.

2.Improves wear resistance, reducing friction and wear.

3.Enables functional coatings:

• Insulating properties (conventional anodizing)
• Local conductivity (with masking or post-processing)
• Specific hardness or thickness requirements (hard anodizing)

When products are used outdoors, under strong light, or exposed to long-term UV radiation, the process is usually upgraded to UV-resistant anodizing.

Sandblasting + Anodizing + UV Resistance: Prevents the oxide layer and color from fading or aging under sunlight, maintaining a long-lasting and uniform appearance.

Sandblasting creates the ideal surface for anodizing, while anodizing protects and functionalizes the metal surface. This combination not only makes the product appearance uniform and beautiful but also improves the performance and reliability of parts. Especially in aerospace, electronics, and precision mechanical components, sandblasting + anodizing has become a standard process.