How to prevent oxidation on the surface of aluminum coil?
The aluminum coils in the company’s inventory will be oxidized on the surface and appear as white spots after being placed for a long time. After cleaning, they will become black spots, which will affect their use. Is there a better and more convenient way to save it?
If aluminum products are exposed to air, they will react with oxygen in the air to form aluminum oxide, which forms a protective layer to prevent oxidation. But if it is removed, this exposes the aluminum inside to the air and oxidizes again.
- The storage environment of aluminum plates should be a dry, bright, well-ventilated, and non-corrosive climate.
- Aluminum coils should try to avoid places where rain and snow leak.
- Strengthen the management of rolling oil, and control its water content below 0.04%.
- The packaging of aluminum coils should be sealed, and an appropriate amount of desiccant should be placed in each coil.
- Do not open the sealed package immediately when transporting from a low-temperature area to an area with high temperature and high humidity.
- The humidity of the wooden shaft and box board of the packing box is not more than 18%, and the temperature of the packaging color aluminum coil is not more than 45 ℃.
- When the aluminum coil is stored, it is strictly forbidden to store it with chemical and moist materials.
Under normal circumstances, aluminum itself is resistant to oxidation. What you said means that the warehouse is very humid, and other acidic substances destroy the dense aluminum oxide protective film. Aluminum coils are not convenient for painting, and wrapping them in plastic film is effective. It is good to put desiccants such as silicon inside
The aluminum coil can be prevented from oxidation by the aluminum coil formation treatment.
The chemical conversion treatment of the aluminum coil is to prevent the surface of the aluminum coil from producing an oxide layer to prevent rust, and to increase the adhesion and corrosion resistance after painting. The appearance of the film conversion layer is a natural color, golden yellow or green-blue. The firmness of the layer combined with the chemical film.
Using passivation technology, a dense oxide film is formed on the surface to isolate the further oxidation of air. There will be a dense oxide film (aluminum oxide) on the surface of aluminum products, which generally protects aluminum products from being oxidized. It should be considered whether the harmful impurities in the aluminum product material exceed the standard.
