How should the issue of discoloration in aluminum profile processing be addressed?

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2021-10-26

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Industry News

How should the issue of discoloration during aluminum profile processing be addressed? Aluminum profiles are alloy materials whose primary component is aluminum. Aluminum billets are heated and extruded to produce aluminum products with various cross-sectional shapes. However, differing proportions of alloying elements result in industrial aluminum profiles with distinct mechanical properties and application areas. As for why aluminum profiles fail to achieve proper coloration during processing, the main causes are as follows. Let’s take a closer look.

1. The anodized film thickness is insufficient. To resolve this, verify that the anodizing process is properly standardized and ensure that parameters such as temperature, voltage, and electrical conductivity remain stable. If any deviations are detected, adjust the process accordingly. If no abnormalities are found, consider extending the anodizing time to achieve the required film thickness.

2. If the dye bath pH is too high, adjust it to the specified value using glacial acetic acid.

3. After oxidation, the workpiece was left in the water tank for too long. It is recommended to proceed with dyeing promptly; if this has already occurred, the workpiece can be placed in the anodizing bath or the nitric acid neutralization bath for appropriate activation before dyeing, which will yield excellent results.

4. Improper selection of dyes. It is necessary to choose suitable dyes.

5. If the dye has decomposed or become moldy, it must be replaced.

6. The oxidation temperature is too low, resulting in a dense oxide film. The oxidation temperature can be appropriately increased.

7. Poor electrical conductivity. This may be due to poor contact between the positive copper rod and the negative lead plate, resulting in batch‑wide conductivity issues. Ensure thorough cleaning of both the positive copper rod and the negative lead plate to maintain reliable electrical contact.

Aluminum profile