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Why is sandblasting and oxidation treatment necessary for aluminum profiles?

2025-06-30

The industrial aluminum profiles we produce are generally divided into two surface treatment methods: sandblasting oxidation and bright oxidation. Sandblasting oxidation is an additional step of sandblasting treatment after the aging of the aluminum profile and before oxidation. Sandblasting means slowly passing the industrial aluminum profile through the sandblasting machine. Very fine cartilage balls will be sprayed inside the sandblasting machine to make even small pits on the surface of the aluminum profile. It looks like the naked eye matte effect of the sand surface, which is gentler than the bright appearance. There are different mesh numbers of cartilage. The larger the mesh number, the finer the sand.

Sandblasting is a physical phenomenon, so sand cannot be sprayed inside the cavity of the profile. Unlike acid sand or alkali sand, it is a chemical reaction. Any surface will have the effect of a sand surface. However, acid sand and alkali sand are not environmentally friendly, and this method is almost no longer used now.


As for why many people prefer sandblasting and oxidizing industrial aluminum profiles, I think there are the following reasons:

1. The matte material gives people a gentler and low-key feeling.

2. Some industrial fields are not suitable for using reflective materials.

3. The sandblasted aluminum profile can conceal the extruded mark (extruded aluminum profiles will have extruded marks).

4. Sand blasting can remove tiny burrs/bulges on industrial aluminum profiles.

5. Sandblasting can also remove the oxide film on the surface of industrial aluminum profiles, so the sandblasting process must be before the oxidation process.

In general, the surface treatment method is chosen according to personal preference. Some people still prefer bright oxidized surfaces and find them clean and refreshing. Both treatment methods have no effect on the later anodizing treatment, and the oxide film still plays a role in wear and corrosion resistance.