What is the cause of the aluminum coloring defects?

The defects of aluminum coloring generally have the following conditions: light color, color difference, dyeing, coloring, white spots, whitening, dyeing and fading, and escaping. How to solve this problem, to ensure that the color difference of each batch of products is consistent, and within the tolerances confirmed by both parties, to meet the requirements of consumers. This requires the production enterprise to study and prevent the surface of the profile when it is electrolytically colored.

Causes and treatment of light color and color difference

1. The thickness of the oxide film is uneven. The possible reason is that the temperature and concentration of the anodizing bath are not uniform. At this time, the bath should be stirred by compressed air to solve such problems.

2. The dyeing temperature or concentration is uneven. A stirring process is introduced while increasing the number of stirrings.

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 most susceptible to dyeing. The solution is to dilute the dye and extend the dyeing time appropriately.

4, poor electrical conductivity. Possible loosening of the hanger, pay attention to the hung to avoid such problems

5, the dye is too thin, can add dye to increase the concentration.

6. The temperature of the dye solution is too low. The dye solution can be warmed to below 60 °C.

7. The dye is not dissolved properly, or there is insoluble dye floating, which is easy to produce chromatic aberration. The solution is to improve dye dissolution.

Causes and treatment of dyeing and not dyeing

1. The anodized film thickness is insufficient. The solution is to check whether the anodizing process is standardized, and whether the temperature, voltage, and conductivity are stable. If there is any abnormality, please adjust the specification accordingly. If there is no abnormality, the oxidation time can be extended to ensure the film thickness is up to standard.

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

3. After the oxidation, the workpiece is placed in the water tank for too long. It is recommended to dye in time. If this has happened, the workpiece can be dyed in the anodizing bath or in the nitric acid and in the tank, and then dyed, the effect will be very good.

4. Improper use of dyes. A suitable dye is required.

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

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

7, poor electrical conductivity. Poor contact in the anode copper rod or cathode lead plate may result in poor conductivity in the batch. Pay attention to cleaning the anode copper rod and the cathode lead plate to ensure good electrical conductivity.

Causes and treatment of white spots and white spots

1. Washing is not clean and should be washed.

2, the water used for washing is too dirty, easy to contaminate the film, at this time should replace the water to ensure the quality of washing.

3. The oxide film is polluted by smoke, acid and alkali mist in the air. Strengthening water washing, timely dyeing, and timely transfer can greatly alleviate this symptom.

4. The oxide film is contaminated by oil stains and perspiration. The protection must be strengthened and the appearance of the workpiece must not be touched by hand.

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

6. There is residual acid in the gap and deep hole of the workpiece, and the workpiece should be washed with water.

7. The dyeing solution is contaminated, causing pitting corrosion of the dyed workpiece. At this time, the dye must be replaced. Attention should be paid to avoid introducing impurity ions during the operation.

Dyeing and flowering, the cause and treatment of escape color

1. The pH of the dye solution is low, and it can be adjusted to the standard value with dilute ammonia water.

2, the cleaning is not clean. Washing should be strengthened.

3. The dye is not completely dissolved, and the dissolution is enhanced to completely dissolve.

4. The temperature of the dyeing solution is too high to lower the temperature.

5. The pores of the oxide film are small, because the oxidation temperature is too low, and the film is inhibited from being dissolved by sulfuric acid, and the oxidation temperature can be appropriately adjusted to avoid this problem.

6. Dyeing and coloring is too fast, and the dyeing time is too short, the dilute dyeing solution can be adjusted, the dyeing temperature is lowered, and the dyeing time is appropriately extended.

7. The sealing temperature is too low and the temperature is solved.

8. The PH value of the plugging solution is too low and is adjusted to the standard value with dilute ammonia water.

9. The dyed surface is easy to wipe off. The main reason is that the film is rough, generally caused by too high oxidation temperature. Care should be taken to control the oxidation temperature within the specification.

After taking corresponding measures for the defects of oxidation coloration, the quality of aluminum coloring products can be stably controlled to meet customer satisfaction requirements.
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