The difference between galvanized steel pipe and hot-dip galvanized steel pipe

A galvanized steel pipe is generally called a cold-dip steel pipe. It adopts an electroplating process. Only the outer wall of the steel pipe is galvanized, and the inner wall of the steel pipe is not galvanized. Hot-dip galvanized steel pipe adopts the hot-dip galvanizing process, and both the inner and outer walls of the steel pipe have a zinc layer.

The difference between galvanized steel pipe and hot-dip galvanized steel pipe:
1. The process is different, one is chemical treatment and the other is physical treatment; hot-dip galvanizing coating is firm and does not easy to fall off
2. Hot-dip galvanizing coating is thick, so it has strong anti-corrosion ability. The galvanized (electroplating) coating is uniform, the surface quality is better, and the coating thickness is generally between a few microns and more than ten microns.
3. Hot-dip galvanizing is a chemical treatment, which belongs to an electrochemical reaction. Galvanizing is a physical treatment, which is just brushing a layer of zinc on the surface. There is no galvanizing inside, so the zinc layer is easy to fall off. Hot-dip galvanizing is mostly used in construction.
4. Hot-dip galvanized steel pipes make the molten metal react with the iron matrix to produce an alloy layer, thereby combining the matrix and the coating.