Product features
MSD-600A phosphating liquid is a normal temperature zinc-based phosphating liquid, which can form a uniform and fine phosphating film at room temperature. It is suitable for priming before painting a variety of household appliances such as air conditioners, televisions, washing machines, refrigerators, microwave ovens, electrical control cabinets and instrumentation. It is especially suitable for priming for powder spraying and electrophoretic paint, and can significantly improve the adhesion and corrosion resistance of the paint film and powder.
Main technical indicators
| Serial number | project | Indicators |
| 1 | Proportion | 3-5% |
| 2 | Total acidity (points) | 25-40 |
| 3 | Free acidity (points) | 0.8-2 |
| 4 | Time (minutes) | 8-25 |
| 5 | accelerator (point) | 2-5 |
| 6 | temperature | normal temperature |
Process flow
Degreasing → washing → rust removal → washing → neutralization → surface conditioning → phosphating → washing
Test instructions
1. Total acidity detection method: Take 10 ml of the bath solution, add 3-4 drops of phenolphthalein indicator, and titrate with 0.1 N NaOH solution until the solution turns light red and no longer disappears after shaking. This is the end point. The number of ml of NaOH solution consumed is Points.
2. Free acidity detection method: Take 10 ml of the bath solution, add 3-4 drops of bromophenol blue indicator, and titrate the solution from yellow to blue-purple with 0.1 N NaOH solution as the end point. The number of ml of NaOH solution consumed is the point number.
3. The accelerator measurement method is to fill the bird-shaped elbow with the bath solution, add about 1g of sulfamic acid reagent, press the mouth of the tube with your right thumb, turn it over for 5 seconds, and then place it flat and let it stand. The scale of the amount of gas generated at the top of the tube will be The number is the number of accelerator points
Add description
1. Add 2 kg of MSD-600A phosphating agent per ton of bath liquid to increase the total acidity by 1 point.
2. Strictly control the accelerator concentration. It is not advisable to add too much. It is appropriate to add small amounts and multiple times.
3. Clean the sediment regularly, and the bath liquid replacement cycle depends on the production situation.
4. Adding 1KG of neutralizer per ton of bath liquid can reduce the free acid by 1 point.
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