Tubular heater Black processing
Tubular heater Black processing
In the production process of the electric heating tube sometimes used to blackening, heat treatment is the heat treatment of stainless steel and other metal objects of a process, the surface after treatment there will be a layer of oxide film to achieve the purpose of corrosion and rust. After the heat treatment will increase the heating tube surface wear resistance, improve the surface hardness, and will not affect the inside of the heating tube components.
Under normal working conditions, the surface heating black tube the easiest way to the following steps:
1, the first metal pipe surface cleaning, keep clean;
2, the second is the surface degreasing treatment, this process can be completely placed in the degreasing metal tube which. Degumming liquid PH value is best in about 13, the time is not less than half an hour. After degreasing wash with water.
3, followed by pickling, pickling solution PH value of about 3, the processing time is not longer than 10 minutes, washed with water after pickling;
4, black treatment: the concentration of liquid pool PH value between 2-4, the processing time of 10 minutes up and down, extremely clean after black;
5, the last drying, oiling;
In accordance with the above five points can be carried out on the black tube heating is still a very effective method.
