Galvanized steel pipe is also called galvanized steel pipe. Galvanized steel pipe can increase the service life of steel pipe and prevent rust to a certain extent. This encyclopedia will introduce the classification, main uses, and process characteristics of galvanized pipes.
1. Hot-dip galvanized steel pipe. The molten metal reacts with the iron matrix to create an alloy layer that allows the matrix and the coating to bond. Hot-dip galvanizing should first pickle the steel pipe to remove iron oxide on the surface of the steel pipe. After pickling, it should be cleaned with an aqueous solution of ammonium chloride or zinc chloride, and then sent to a hot-dip bath for hot-dip plating. The coating of hot-dip galvanizing is relatively uniform, the adsorption capacity is relatively strong, and the service life is long.
2. Cold galvanized steel pipe. Cold galvanizing is electro-galvanizing. The amount of galvanizing is relatively small, and the corrosion resistance and service life are much worse than those of hot-dip galvanized pipes.
3. Hot-dip galvanized steel pipe. The zinc-iron alloy layer is formed by the reaction between the steel pipe and the plating solution, the alloy layer is integrated with the pure zinc layer and the steel pipe, and the corrosion resistance is relatively strong.
4. Cold galvanized steel pipe. The zinc layer and the steel pipe are independent layers, the zinc layer is relatively thin, the zinc layer is simply attached to the surface of the steel pipe, and the zinc layer is easier to fall off, so cold galvanized steel pipe is not allowed to be used as a water pipe.
The main purpose
Galvanized steel pipes are usually used to loosen gas and heating, and the galvanized pipe layer is also used as water pipes, but after a few years of use, a large amount of rust will be produced. The yellow water that flows out will not only pollute the sanitary ware but also breed bacteria on the inner wall. . Rust can also cause excessive heavy metal content in water, further harming human health.
The advantage of sulfate galvanizing is that the current utilization rate reaches 100%, and the deposition rate is very fast. However, because the crystallization of the coating is not detailed enough, the deep plating ability is poor, and it is only suitable for pipes and wires with simple geometric shapes. After the improvement of the process, iron salt is also added to the original solution, which not only inherits the advantages of traditional sulfate zinc plating but also strengthens the ability of deep plating. After continuous improvement, the coating grains for wires and pipes are more delicate and shiny than before.