Meltblown cloth heating tube blackening treatment

1. First clean the surface of the metal pipe to keep it clean;

2. The second is the surface degreasing treatment, this process can completely place the metal tube in the degreasing solution. The PH value of the degreasing solution is preferably about 13, and the time is not less than half an hour. Rinse with clean water after degreasing.

3. Next, pickling can be carried out. The PH value of the pickling solution is about 3, and the processing time can be no longer than 10 minutes. After pickling, wash with clean water;

4. Blackening treatment: the concentration of the pond liquid is between 2-4 and the treatment time is about 10 minutes. After blackening, it is extremely clean;

5. Finally, drying and oiling;