1. Hot-dip galvanized pipe. Let the molten metal react with the iron matrix to produce an alloy layer, allowing the matrix and coating to bond. Hot-dip galvanizing must first pickle the steel pipe to remove the iron oxide on the surface of the steel pipe. After pickling, it must be cleaned with an aqueous solution of ammonium chloride or zinc chloride and then sent to a hot-dip tank for hot-dip galvanizing. The coating of hot-dip galvanizing is relatively uniform, has strong adsorption capacity, and has a long service life.
2. Cold galvanized pipe. Cold galvanizing is electro-galvanizing. The amount of galvanizing is relatively small, and its corrosion resistance and service life are much worse than hot-dip galvanized pipes.
3. Hot-dip galvanized steel pipe. The zinc-iron alloy layer formed by the reaction between the steel pipe and the plating bath, the alloy layer, the pure zinc layer, and the steel pipe are integrated, and the corrosion resistance is relatively strong.
4. Cold galvanized steel pipe. The zinc layer and the steel pipe are independently layered. The zinc layer is relatively thin. The zinc layer is simply attached to the surface of the steel pipe. The zinc layer is easy to fall off. Therefore, cold-dip galvanized steel pipes are not allowed to be used as water pipes.
Post time: Nov-27-2023