In the production process of electric heating tubes, blackening treatment is sometimes used. Heat treatment is a process of heat treating metal objects such as stainless steel. After treatment, a layer of oxide film forms on the surface to achieve anti-corrosion and rust prevention. After heat treatment, the wear resistance of the heating tube surface is improved, the surface hardness is increased, and it does not affect the internal components of the electric heating tube.
Under normal working conditions, the simple steps for blackening treatment of the electric heating tube surface are as follows:
1. First, clean the metal tube surface to keep it clean;
2. Second, perform degreasing treatment on the surface. This process can completely immerse the metal tube in the degreasing solution. The pH value of the degreasing solution
3. Next, pickling can be carried out. The pH value of the pickling solution is about 3, and the treatment time should not exceed 10 minutes. After pickling, rinse with clean water;
4. Blackening treatment: The pH value of the bath solution is between 2-4, and the treatment time is about 10 minutes. After blackening, clean thoroughly;
5. Finally, dry and oil;
Following the above five steps is a very effective method for blackening treatment of electric heating tubes.
