Towel racks are cleaned and kept clean

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

2. The second is to degreasing the surface. This process can completely place the metal tube in the degreasing solution. The PH value of the degreasing solution is preferably around 13, and the time is not less than half an hour. Degreased and washed with water after this.

3. Next, pickling can be performed. The pH value of the pickling solution is about 3, and the disposal time is less than 10 minutes. After the pickling, clean it with water;

4. Blackening treatment: the liquid concentration of the pool liquid is between 2-4, the treatment time is about 10 minutes, and the blackening is extremely clean after this;

5. Finally, bake and oil;