Galvanized pipe is a kind of pipe commonly used in our lives. This pipe is mainly divided into two types in the production process, one is hot-dip galvanized pipe and the other is cold-dip galvanized pipe. What are the classifications of galvanized pipes?
Hot-dip galvanized pipe
It is to make the molten metal react with the iron matrix to produce an alloy layer, so that the matrix and the plating layer are combined. Hot-dip galvanizing has the advantages of uniform coating, strong adhesion and long service life.
Cold galvanized pipe
Cold galvanizing is electro-galvanizing, and the amount of galvanizing is very small, only 10-50g/m2, and its corrosion resistance is much worse than that of hot-dip galvanized pipes. Most of the regular galvanized pipe manufacturers do not use electro-galvanization (cold plating) in order to ensure the quality.
Hot dip galvanized steel
Complicated physical and chemical reactions occur between the steel pipe matrix and the molten plating solution to form a corrosion-resistant zinc-iron alloy layer with a compact structure. Hot-dip galvanized steel pipes are widely used in fire fighting, electric power and highways.
Cold galvanized steel pipe
The zinc layer is an electroplated layer, and the zinc layer is layered independently from the steel pipe substrate. The zinc layer is thin, and the zinc layer simply adheres to the steel pipe substrate and is easy to fall off. Therefore, its corrosion resistance is poor. In newly-built houses, it is prohibited to use cold-galvanized steel pipes as water supply pipes.
