Aluminum coil is one of our main products. As a professional manufacturer of aluminium coil, we have advanced production technology and profound knowledge of aluminium coil.
1. Pretreatment: physical and chemical cleaning of the surface of aluminium coil, the most important of which is to expose the aluminium coil to the matrix.
2. After anodic oxidation, the matrix undergoes anodic oxidation reaction after aluminium coil treatment, forming a dense oxide film.
3-hole seal, after anodic oxidation, there will be many holes in the oxide film. The purpose of the hole seal is to make the film hole closed and prevent the oxide film pollution. The oxide film is transparent, but also has adsorption, which deposits metal salts in some holes, so it can show some original silver white on the surface, or many colors on the surface. This is the process of colouring the whole aluminium coil sheet. In the process of processing, we need to pay attention to the change of the aluminium sheet.
Because aluminium coil can be oxidized to form dense alumina film and react with aluminium continuously, the white spot of aluminium coil should be a normal phenomenon.
However, due to the strict surface requirements of the aluminium coil plate, how to avoid the appearance of white spots on the surface of the aluminium coil plate to make the product smoother and brighter is not only related to the processing technology, but also closely related to the later surface treatment process.
Aluminum coil manufacturer
In the process of anodic oxidation of large aluminium coil alloy products, it was found that white spots appeared on the surface after processing, especially alumina coil. Here, we will analyze the reasons for this phenomenon.
Actually, the main reason is very simple: the aluminium coil is not cleaned thoroughly after oxidation, resulting in white spots on the surface after drying. The solution is to strengthen the cleaning after oxidation and try to clean thoroughly with water gun. At the same time, after cleaning, pay attention to protecting the surface, try not to contact with other products, natural air-drying.
It is also hoped that better control of white spot surface of aluminium coiled sheets should not only pay attention to the surface pretreatment of products, but also pay attention to preventing surface treatment processing, processing and processing standards to strictly avoid the formation of white spots. Alkali clean white spot pickling is good, but the concentration should be controlled, otherwise spray paint, blocking the contact between aluminum and oxygen.
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