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What are the reasons why the surface of the aluminum profile cannot be colored?

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Update time : 2022-09-09 18:50:53
Aluminum profiles have been widely used and praised in different industries. Usually, aluminum profiles will do some surface treatment before they are put into the market. Coloring is a relatively common solution. However, in the process of processing, it often occurs that the surface of the aluminum profile cannot be colored. What is the specific reason?
1. The thickness of the anodic oxide film is not enough. The operation of the anodizing process should be standardized, and the temperature, voltage and other issues should be kept stable. If there is an abnormal situation, it should be standardized and adjusted. If there is no abnormality, the oxidation time can be appropriately extended to ensure that the thickness of the film reaches the standard.
2. Poor electrical conductivity. Poor contact between the anode copper rod or the cathode lead plate will cause poor batch conduction. We usually pay attention to cleaning the anode copper rod and the cathode lead plate to ensure good contact.
3. If the pH value of the dye solution is too high, glacial acetic acid can be used to adjust the pH value to the standard value range.
4. If the oxidation temperature is too low, the oxide film will be too dense, which can be solved by appropriately increasing the oxidation temperature.
5. After oxidation, the workpiece stays in the water tank for too long. We advocate timely dyeing, but if it cannot be done, the workpiece can be properly activated in an anodizing tank before dyeing, and the effect will be better.
When the aluminum profile is colored, the pH value has a great influence on the dyeing effect. Therefore, when the aluminum profile is dyed, it must be strictly operated, and attention must be paid to the precautions in each link to prevent the occurrence of non-dyeing.
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