The defects of aluminum coloring generally have the following conditions: light color, color difference, dyeing, white spot, white, dyeing, color escape, etc.How to solve this problem to ensure that the color difference of each batch of products remains consistent and within the range of deviations confirmed by both parties to meet consumer requirements.This requires the production enterprises to study and guard against the electrochemical coloring surface treatment of profiles.
Cause and treatment of light color and color difference
1. The thickness of oxide film is uneven.The possible reason is that the temperature and concentration of the anodic oxidation tank liquid are uneven. At this time, the tank liquid should be stirred with compressed air to solve such problems.
2. The temperature or concentration of the dye solution is uneven.The mixing process was introduced and the mixing times were increased.
3, dyeing speed is too fast.The bottom of the workpiece first into the dye solution and finally leave the dye solution, so the bottom is the most easy to dye deep.The solution is to adjust dilute dyes, appropriate extension of dyeing time.
4, poor electrical conductivity.May be caused by loose hangers, pay attention to the hanging can avoid such problems
5, the dye is too thin, can be added to improve the concentration.
6. The temperature of dye solution is too low.The dye solution can be heated to below 60℃.
7, the dye dissolves improperly, or there is insoluble dye floating, easy to produce color difference.The solution is to improve the dye dissolution.
Causes and treatment of dyeing failure
1. Insufficient thickness of anodic oxidation film.The solution is to check whether the anodic oxidation process is standardized, to see whether the temperature, voltage, conductivity and other factors are stable, if abnormal, please adjust the corresponding specification, if there is no abnormality, can be appropriately extended oxidation time, to ensure that the film thickness is up to the standard.
2. The pH value of 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 tank 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 appropriate activation treatment and then dyed, the effect will be very good.
4. Improper selection of dyes.The right dye should be selected.
5, the dye has been decomposed or moldy, at this time need to replace the dye.
6, the oxidation temperature is too low, resulting in the skin film density.The oxidation temperature can be increased appropriately.
7, poor electrical conductivity.Possibility of poor batch conduction as shown by poor contact of anode copper rod or cathode lead plate.Pay attention to clean the anode copper rod and cathode lead plate to ensure good conductivity.
Causes and treatment of white spots and exposure
1, water is not clean, water should be strengthened.
2. The water used for washing is too dirty and easy to pollute the film. At this time, the water should be replaced to ensure the quality of washing.
3. Oxide film is polluted by smoke and dust in the air, acid and alkali mist.Enhanced washing, timely dyeing, timely transfer can greatly reduce this symptom.
4, the oxide film is polluted by oil and sweat stains.Must strengthen the protection, do not touch the appearance of the workpiece 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 tank liquid should be cleaned regularly.
6, the workpiece gap, deep hole residual acid flow out, to strengthen the washing of this kind of workpiece.
7,The dye solution is polluted and causes pitting corrosion of the dyed workpiece. At this time, the dye must be replaced.
Causes and treatment of dyeing inhomogeneity
1. The pH value of dye solution is low, and dilute ammonia water can be adjusted to the standard value.
2, cleaning is not clean.Water should be washed intensively.
3, the dye is not completely dissolved, strengthen the dissolution to complete dissolution.
4, dye temperature is too high, reduce the temperature.
5, the oxidation film pore is small, the reason is that the oxidation temperature is too low, inhibit the skin film is dissolved by sulfuric acid, can be appropriately adjusted to high oxidation temperature to avoid this problem.
6, dyeing and coloring too fast, and dyeing time is too short, dilute dye can be adjusted, reduce dyeing temperature, appropriate to extend the dyeing time.
7, sealing hole temperature is too low, heating solution.
8. If the pH value of the hole sealing solution is too low, adjust it to the standard value with dilute ammonia water.
9. The dyed surface is easy to erase.The main reason is rough film, generally oxidation temperature is too high.Attention should be paid to control the oxidation temperature within the standard range.
On the defects of hair oxidation coloring, take the corresponding measures, the quality of aluminum coloring products must be able to stable control, to meet customer satisfaction requirements.
Post time: Apr-02-2021
