How to solve the problem of blackening of the electric heating tube? If the heating tube is used for a long time, the heating tube will turn black over time. Simple steps for blackening treatment of electric heating tube:
a The premise of the blackening treatment is to keep the surface of the heating tube clean and clean. If there are impurities on the surface, it will not be conducive to the treatment of blackening.
b The first thing to do is to clear the organic matter on the surface, the so-called degreasing treatment. Here everyone should rest assured that degreasing treatment is very easy to do. As long as there is a degreasing liquid for the degreasing process. The degreasing fluid is also easily available on the market. The requirement of degreasing treatment is the requirement of liquid pH, to maintain extremely high alkalinity, and probably the pH value should be stable at about 13. The time requirement is about 30 minutes. After this treatment, the surface should be cleaned to remove impurities generated by chemical reactions. Clean water must be used for cleaning to ensure a high degree of cleanliness on the surface of the heating tube.
c Pickling is required after alkaline washing. Because there are not only alkaline organic matter on its surface, but also acidic organic matter. So acid cleaning is also very necessary. The acidic requirement is a pH of 3, and the processing time is no more than 10 minutes or so.
d Finally, the formal blackening process is about to be carried out. Ph guaranteed between 2~4. The time is 10 minutes. Clean it after processing.
The last step is to dry the heating tube. Drying is to remove the clean water adhering to the surface of the heating tube. The last is oiling.
The blackening treatment is used in the production process of the electric heating tube. If the above five points are followed, the blackening treatment of the electric heating tube can be carried out. After the treatment, the wear resistance of the surface of the electric heating tube will be improved, and the hardness of the surface will be improved, and the parts inside the electric heating tube will not be affected.