Galvanized steel pipe, commonly known as cold galvanized steel pipe, 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. The hot-dip galvanized steel pipe adopts the hot-dip galvanizing process, and the inner and outer walls of the steel pipe have zinc layers.
1. The process is different, one is chemical treatment, the other is physical treatment; the hot-dip galvanized coating is reliable and not easy to fall off.
2. The hot-dip galvanized coating is thick, so the anti-corrosion ability is strong. The galvanized (electroplating) coating is uniform, the surface quality is good, and the thickness of the coating is generally between a few microns to ten microns.
3. Hot-dip galvanizing is a chemical treatment, which is an electrochemical reaction. Galvanizing is a physical treatment, just brush a layer of zinc on the surface, there is no galvanized inside at all, so the zinc layer is easy to fall off. Hot-dip galvanizing is often used in construction.
4. The hot-dip galvanized pipe is to make the molten metal react with the iron matrix to produce an alloy layer so that the matrix and the coating are combined.