Galvanized steel pipe, commonly known as cold-galvanized 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 a zinc layer.
1. The process is different, one is chemical treatment and the other is physical treatment; the hot-dip galvanized coating is firm and does 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 better, and the thickness of the coating is generally between a few microns and more than ten microns.
3. Hot-dip galvanizing is a chemical treatment and belongs to an electrochemical reaction. Galvanizing is a physical treatment, just brushing a layer of zinc on the surface, and there is no galvanizing inside, so the zinc layer is easy to fall off. Hot-dip galvanizing is often used in building construction.
4. The hot-dip galvanized pipe reacts the molten metal with the iron matrix to form an alloy layer so that the matrix and the coating are combined.