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What about aluminum coloring defects?

Release time:

2022-06-24 15:23

Have you ever encountered the defects of aluminum coloring? Like light color, color difference, unable to color, etc.

Today, Ann will give you a big answer to your question ~

Q1

What is the cause of light color difference? How to deal with it?

1. The film thickness of oxide skin is uneven. The possible reason is that the temperature and concentration of the anodic oxidation tank solution are uneven. At this time, the tank solution should be stirred by compressed air to solve such problems.

2. The temperature or concentration of the dye solution is uneven. Introduce the stirring process, while increasing the number of stirring.

3. The dyeing speed is too fast. The bottom of the workpiece first enters the dye solution and finally leaves the dye solution, so the bottom is the most easy to dye deeply. The solution is to dilute the dye and extend the dyeing time appropriately.

4. Poor conductivity. It may be caused by loosening of hanging tools. Pay attention to hanging tightly to avoid such problems.

5, the dye is too dilute, can add dye, increase the concentration.

6. The temperature of the dye solution is too low. The dye solution can be heated to below 60 ℃.

7, the dye is not dissolved properly, or there are insoluble dyes floating, at this time easy to produce color difference. The solution is to improve the dye dissolution.

 

Q2

dye do not color?

1. Insufficient thickness of anodic oxide film. The solution is to check whether the anodic oxidation process is standardized, and see whether the temperature, voltage, conductivity and other factors are stable. If there is any abnormality, please adjust the specification accordingly. If there is no abnormality, the oxidation time can be appropriately extended to ensure the film thickness reaches the standard.

2. The PH value of the dye solution is too high. At this time, glacial acetic acid can be used to adjust the PH value to the standard value.

3. After oxidation, the workpiece is placed in the sink for too long. Advocate timely dyeing, if this situation has occurred, the workpiece can be placed in the anodic oxidation tank or nitric acid neutralization tank in the appropriate activation treatment before dyeing, the effect will be very good.

4. Improper selection of dyes. Need to choose the appropriate dye.

5. The dye has been decomposed or mildew, and the dye needs to be replaced at this time.

6, the oxidation temperature is too low, resulting in dense film. The oxidation temperature may be appropriately increased.

7. Poor conductivity. Possible poor contact of the anode copper rod or cathode lead plate as shown in the batch conductivity. Pay attention to clean the anode copper rod and cathode lead plate to ensure good conductivity.

 

Q3

Why are there white spots and white dew?

1, washing is not clean, should strengthen the washing.

2. The water used for washing is too dirty and easy to pollute the membrane. At this time, the water should be replaced to ensure the quality of washing.

3. The oxide film is polluted by smoke, acid and alkali mist in the air. Strengthen water washing, timely staining, timely transfer can greatly reduce the symptoms.

4. The oxide film is polluted by oil and sweat. The protection must be strengthened, and the appearance surface of the workpiece should not be touched by hand.

5. There are insoluble impurities in the dye solution, which are contaminated by oil and destroy the normal dyeing. At this time, the dye solution should be filtered or replaced, and the bath solution should be cleaned regularly.

6, the workpiece gap, deep hole in the residual acid outflow, to strengthen the washing of this kind of workpiece.

7, the dye solution is contaminated, causing corrosion of the dyeing workpiece, the dye must be replaced at this time, usually should pay attention to avoid the introduction of impurity ions in the operation process.