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How to control the chromatic aberration during the anodization of aluminum products

How to control the chromatic aberration during the anodization of aluminum products

How to control the chromatic aberration during the anodization of aluminum products is really a very professional problem for the mechanical processing plants of non-metallic surface treatment manufacturers. Because our specialty is only mechanical processing, and the surface treatment is done by a professional outsourcing factory.
First of all, let’s take a look at the common quality defects in the anodizing process. In the actual surface treatment, the color of each batch of products will also be different due to differences in personnel, processes, equipment, and operating procedures. Mainly there are phenomena such as light color, color difference, non-dyeing, white spots, whitening, dyeing and fading, and color escape.
cnc anodized aluminum tube 1
So, how to solve this problem to ensure that the color difference of each batch of products is consistent and within the deviation range confirmed by both parties to meet customer needs?

Solution :

1. Uneven oxide film thickness

The possible cause is uneven temperature and concentration of the anodizing bath solution. At this time, the bath solution should be stirred with compressed air to solve such problems.

2. Uneven dyeing temperature or concentration

Introduce the mixing process and increase the number of mixing at the same time

3. Dyeing speed is too fast

The bottom of the workpiece enters the dye solution first and leaves the dye solution last, so the bottom is the easiest to dye deeply. The solution is to dilute the dye and appropriately extend the dyeing time.

4. Poor conductivity

It may be caused by a loose hanger. Pay attention to the hanger to avoid such problems.

5. Dye is too thin

Dyes can be added to increase the concentration

6.  The temperature of the dye solution is too low

Can heat the dye solution to below 60℃

7. Improper dissolution of dyes, or floating of insoluble dyes.

At this time, the color difference is easy to occur, and the solution is to improve the dissolution of the dye
The above is for the chromatic aberration of a single product itself and the reasons and treatment methods for the chromatic aberration of different sides of the same product. How do we control the color difference produced by different batches? It is to digitize and standardize the processing parameters of each batch. For example, the concentration and temperature of the dye solution and the dyeing time of each batch of surface treatment are controlled to the same standards as those in the trial or the previous batch, which can be reduced. It can even avoid the generation of batch chromatic aberration.
In addition, there are also the causes and treatments of the phenomena such as no dyeing, white spots, whitening, dyeing and fading, and color escape. Let’s discuss and learn together next time.
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