The chemical skilled method is immersed in the tank, and the skilled tank is made of steel plate, and the inner wall is covered with polyvinyl chloride or polyethylene. Use 12-15%nitric acid for chemical abandonment, the temperature is 40 ° C to 60 ° C, and the time is 2 to 4 hours. When dipped in a galvanized steel pipe into the tank, pay attention to the place where the air is left to prevent residual air in the pipe. During the soaking process, the galvanized steel pipe should be moved up and down or flipped, so that the solution in the inner cavity should be continuously replaced to improve the effect.
If necessary, remove the steel pipe, rinse it with water, and soak. Chemical removal until the surface of the galvanized steel pipe is completely wet by water; rinse it with hot water, remove the galvanized steel pipe after the oil removal, and soak it in a hot water tank of about 40-60 ° C. 5-20 minute.
The water tank is made of steel plate, the inner wall is covered with PVC or polyethylene, and the chlorine ion content in the water is less than 25 ppm; the galvanized steel pipe rinsed with hot water is rinsed with pressure water, and the chlorine ion content in the water is less than 25 ppm; The formula and soaking time of the liquid liquid are operated according to relevant specifications.
It is made of passivation steel plate and has a acid -resistant plastic inner wall. When soaking in the tank, pay attention to the placement to prevent the air from the air in the tube. During the soaking process, the galvanized steel pipe should be moved up and down or flipped, so that the solution in the inner cavity should be continuously replaced to improve the effect.
If necessary, remove the galvanized steel pipe and wash it with water before soaking; if the pipe is dry, the passivated galvanized steel pipe should be dried with clean compressed air or nitrogen, and it must have enough time to maintain natural passivation in the air naturally passivation in the air. ; Quality inspection, after the galvanized steel pipe is passivated, conduct self -examination and mutual inspection, and check the inspection inspection as required; packaging and maintenance. If the surface of the galvanized steel pipe needs to be painted, it should be according to the requirements of the loading. After the inspection, the galvanized steel pipe is sealed with plastic seal, wraps in three anti -cloth cloth for maintenance, and marked.
