Hot-Dip Galvanized PipeIt involves causing the molten metal to react with the iron substrate to form an alloy layer, thereby combining both the substrate and the coating. Hot-dip galvanizing first involves pickling steel pipes to remove surface oxide iron. After pickling, the pipes are cleaned in a bath of ammonium chloride or zinc chloride solution, or a mixture of both. They are then sent to the hot-dip galvanizing tank. Hot-dip galvanizing offers advantages such as even coating, strong adhesion, and long service life. The steel pipe substrate undergoes complex physical and chemical reactions with the molten coating to form a tightly structured, corrosion-resistant zinc-iron alloy layer. This alloy layer merges with the pure zinc layer and the steel pipe substrate, hence enhancing its corrosion resistance.