[China Aluminum Industry Network] First, the cause of discoloration of the paint film:
1. There is a residual treatment liquid on the coating surface.
2. Excessive baking, or volatile gases in the furnace.
3. Mix with other colors of powder during construction.
4. The pigment itself of the powder is not resistant to high temperatures or yellowing of the resin.
Solution:
1. Improve the pre-processing method.
2. Develop proper baking conditions and purify the oven.
3. Strengthen the cleanup before construction.
4. Replace the qualified powder coating.
Second, the surface of the coating film particles cause:
1. The surface of the coated workpiece is not clean 2. The powder supply is uneven and the spray gun is not well atomized.
3. The powder is too fine or the powder is moistened and clumps, making the gun powder.
4. The painting site is not clean or there is powder dripping in the spray booth.
5. The quality of the recovered powder or powder itself is poor.
Solution:
1. Improve the quality of the workpiece substrate and strengthen the pre-treatment.
2. Adjust the air pressure and check the deflector to a better point.
3. Control the particle size distribution of the powder and keep it in a safe place to prevent moisture.
4. Clean up the site and purify the air.
5. After the recycling powder is sifted, the new powder is mixed and replaced with qualified powder.
Third, shrinkage hole causes:
1. The surface of the workpiece is oily.
2. Water, oil, etc. in the compressed air cause the powder to be contaminated.
3. Contaminated by dust or other impurities 3. The powder coating itself has pollution solution:
1. Strengthen the pre-treatment.
2. Strengthen the purification of compressed air before painting.
3. Thoroughly clean the environment and replace the qualified powder.
Fourth, poor leveling or orange peel causes serious:
1. The surface of the workpiece is rough.
2. The powder particles are coarse, damp or the powder leveling itself is poor 3. The curing temperature is high or low 4. The coating film is too thin or too thick.
5. The workpiece is badly grounded.
6. Different powders are mixed.
Solution:
1. Improve the workpiece finish.
2. Select high-quality powders with evenly distributed, well-distributed particles, and prevent the powder from getting damp.
3. Adjust the appropriate curing conditions.
4. Control the powder thickness at 60-80 μm.
5. Clean up the rack regularly.
6. Strictly clean the dusting system and site before construction to avoid the mixing of powders of different types or different manufacturers.
Fifth, the cause of loss of light on the surface of the coating film:
1. The quality of the substrate is poor.
2. The baking time is too long or the temperature is too high.
3. There are volatile gases in the furnace.
4. The proportion of recycled powder is too large.
5. Two different types of powder mix.
6. Poor quality of powder coating.
Solution:
1. Select the appropriate pretreatment process.
2. Adjust the appropriate curing conditions.
3. Purify the oven.
4. The recycled powder is filtered and mixed with fresh powder, preferably less than 30%.
5. Thoroughly clean the dusting system before changing powder.
6. Replace the powder with good quality.
Sixth, the coating has pores, pinholes cause:
1. The workpiece surface has pores.
2. Residues on the surface of the workpiece are treated with degreasing and rust prevention.
3. The conductive putty is too thick to be dried.
4. The spray gun is too close to the workpiece and the application voltage is too high, causing the coating to break down.
5. There are volatile gases in the drying tunnel.
6. The coating is too thick or the coating is not fully cured.
7. Powder coating itself problem solution:
1. Strengthen the processing of the workpiece.
2. Improve the pre-treatment process.
3. Prolong baking time.
4. Adjust the process parameters.
5. Clean the drying tunnel and purify the gas in the furnace.
6. Control coating thickness to 50-80μm, adjust curing conditions.
7. Replace the qualified powder coating 7. The mechanical performance of the coating film is poor, and the entire coating is peeled off.
1. The quality of the substrate is poor and the pre-treatment method is improper.
2. Improper baking conditions, incomplete curing or excessive baking.
3. The powder quality is poor or has exceeded the shelf life.
Solution:
1. Improve pre-processing.
2. Determine the proper baking process.
3. The use of qualified powder, overdue need for a comprehensive inspection.
Eight, coating corrosion resistance causes:
1. The coating film is not fully cured.
2. The oven temperature is not uniform and the temperature difference is large.
3. The workpiece is not handled properly.
4. Poor performance of powder coating solution:
1. Adjust baking conditions according to paint properties.
2. Choose a suitable oven with a temperature difference of ±5°C from top to bottom.
3. Strengthen the pre-treatment to avoid the treatment liquid remaining on the surface of the workpiece.
4. Replace qualified powder coating.
Nine, poor adsorption of powder flying causes:
1. The static generator does not generate high pressure or high pressure.
2. The workpiece is badly grounded.
3. The air pressure is too large.
4. The air duct in the recovery device is blocked.
5. Incomplete treatment (rust, oil).
6. Powder coating itself problem solution:
1. Check the static generator and adjust the voltage.
2. Clean the rack and keep it grounded.
3. Adjust the air pressure.
4. Clean the recovery unit.
5. Strengthen the pre-treatment process.
6. The use of qualified powder coatings Tenth, the amount of non-uniform powder supply when the amount of high and low causes:
1. Partial blocking of the powder tube, poor powder flowability.
2. Insufficient air pressure and unstable pressure.
3. The air is mixed with oil and water.
4. The powder feeder is fluidized and the powder feeder powder is too little.
Solution:
1. Clean out the debris or agglomeration of the powder tube, keep the powder tube open, and adjust the powder coating powder dryness.
2. Select the right air compressor.
3. Regularly exclude the oil and water in the air compressor.
4. Keep the fluidized bed stable in pressure and periodically add new powder.
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