Cold galvanized pipe is galvanized, the amount of galvanized is very small, only 10-50g/m2, its corrosion resistance is much different than hot galvanized pipe. Regular galvanized pipe manufacturers, in order to ensure quality, most do not use galvanized (cold plating). Only small businesses with obsolete equipment adopt galvanizing, and their prices are relatively cheap. At present, the Ministry of Construction has formally set down the following, the elimination of backward technology of cold galvanized pipes, cold galvanized pipes are not allowed to be used for water, gas pipes. The galvanized layer of cold galvanized steel pipe is an electroplating layer, and the zinc layer is separately separated from the steel tube substrate. The zinc layer is thin, and the zinc layer is simply attached to the steel tube substrate, so it is easy to fall off. Therefore, its corrosion resistance is poor. In new buildings, cold galvanized steel pipes are not allowed to be used as water pipes.
Coating cold galvanizing
This kind of cold galvanized square pipe is mainly coated with zinc coating material on the surface of the square pipe. This will form a zinc coating on the surface of the square pipe. This coating can greatly isolate the square pipe from the outside contact and effectively prevent the atmospheric corrosion of the square pipe. But its disadvantage is due to the coating galvanizing, so the galvanizing layer is not very stable, easy to scratch and brush off. But it also has its advantages and convenience. Because once we find any damage, we can use paint to remedy the damage without re-galvanizing. This is comparable to other galvanized square tubes.
2. Galvanized cold galvanizing
The galvanized square tubes produced by this method are the most important products in the cold galvanized square tubes. Because this galvanizing method has the characteristics of low production cost, easy operation and stable galvanizing coating. This is why many of our galvanized square tube manufacturers look at this galvanized square tube.
The principle of zinc electroplating mainly depends on the formation of uniform, compact and well-bonded zinc deposits on the surface of the parts by electrolysis. The zinc coating produced by this galvanizing process is relatively stable and is not easy to fall off, which greatly adds to the corrosion resistance of this cold galvanized tube. The problem of stabilizing the zinc layer in other cold galvanizing methods is effectively solved.