1. Pre-cleaning preparation
First, the surface of the electric heating tube is cleaned to remove impurities, thereby ensuring the cleanness and cleanliness of the surface of the electric heating tube.
The electric heating tube is immersed in a degreasing night with a pH value of about 13. The degreasing solution is easily available on the market. It is immersed in an alkaline degreasing solution for about 30 minutes. The surface of the heating pipe is treated with water Remove impurities from chemical reactions on the surface to ensure surface cleanliness.
After the degreasing treatment, there will be alkaline substances and alkaline substances on the surface of the heating tube. Therefore, acidic liquids need to be cleaned. Generally, the pH value of the acidic liquid is about 3, and the immersion time is about 10 minutes. Perform cleaning.
4. Blackening treatment
Ensure that the liquid PH value is between 2-4 and the processing time is about 10 minutes. After the treatment, the surface of the heating pipe is cleaned.
5.Drying and oiling
After the surface of the electric heating tube is chemically treated and cleaned, the surface of the electric heating tube is dried to remove the clear water from the surface, and the electric heating tube is oiled after drying. After the blackening treatment, an oxide film on the surface of the heating pipe will be produced, which has a good corrosion resistance and protection effect on the heating pipe.